diff --git a/CMakeLists.txt b/CMakeLists.txt
index 890e907..b1204fa 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -18,12 +18,20 @@ FetchContent_MakeAvailable(SFML)
 add_executable(SortLab
     src/main.cpp
     src/App.cpp
+    src/App_audio.cpp
     src/Array.cpp
+    src/Sorter.cpp
+    src/UI.cpp
+    src/sorters/BubbleSorter.cpp
+    src/sorters/SelectionSorter.cpp
+    src/sorters/InsertionSorter.cpp
+    src/sorters/MergeSorter.cpp
+    src/sorters/QuickSorter.cpp
 )
 
 target_include_directories(SortLab PRIVATE ${CMAKE_SOURCE_DIR}/include)
 
-target_link_libraries(SortLab PRIVATE sfml-graphics sfml-window sfml-system)
+target_link_libraries(SortLab PRIVATE sfml-graphics sfml-window sfml-system sfml-audio)
 
 
 if(WIN32)
diff --git a/assets/fonts/Roboto-Regular.ttf b/assets/fonts/Roboto-Regular.ttf
new file mode 100644
index 0000000..ddee473
Binary files /dev/null and b/assets/fonts/Roboto-Regular.ttf differ
diff --git a/include/App.hpp b/include/App.hpp
index 7ea5cda..db26d86 100644
--- a/include/App.hpp
+++ b/include/App.hpp
@@ -1,6 +1,10 @@
 #pragma once
 #include <SFML/Graphics.hpp>
+#include <SFML/Audio.hpp>
+#include <memory>
 #include "Array.hpp"
+#include "Sorter.hpp"
+#include "UI.hpp"
 
 class App {
 public:
@@ -11,7 +15,26 @@ private:
     void handleEvents();
     void update(float dt);
     void render();
+    void switchSorter(std::unique_ptr<Sorter> newSorter);
+    void generateBeepSound();
+    void playBeep(float pitch);
 
     sf::RenderWindow window_;
     Array array_;
+    std::unique_ptr<Sorter> currentSorter_;
+    UI ui_;
+    bool isPlaying_;
+    float timeSinceLastStep_;
+    float stepDelay_;
+    
+    sf::SoundBuffer beepBuffer_;
+    sf::Sound beepSound_;
+    
+    bool isSweeping_;
+    int sweepIndex_;
+    float sweepTimer_;
+    float sweepDelay_;
+    
+    size_t lastComparisons_;
+    size_t lastSwaps_;
 };
diff --git a/include/Array.hpp b/include/Array.hpp
index cbe91ca..6a5e7a4 100644
--- a/include/Array.hpp
+++ b/include/Array.hpp
@@ -15,8 +15,16 @@ public:
     void setValue(int index, float value);
     void setState(int index, State state);
     void resetStates();
+    void resetCounters();
+    
+    size_t getComparisons() const;
+    size_t getSwaps() const;
+    void incrementComparisons();
+    void incrementSwaps();
 
 private:
     std::vector<float> data_;
     std::vector<State> states_;
+    size_t comparisons_;
+    size_t swaps_;
 };
diff --git a/include/Sorter.hpp b/include/Sorter.hpp
index e69de29..fffd93a 100644
--- a/include/Sorter.hpp
+++ b/include/Sorter.hpp
@@ -0,0 +1,13 @@
+#pragma once
+#include "Array.hpp"
+#include <string>
+
+class Sorter {
+public:
+    virtual ~Sorter() = default;
+    
+    virtual void step(Array& array) = 0;
+    virtual bool isFinished() const = 0;
+    virtual std::string getName() const = 0;
+    virtual void reset() = 0;
+};
diff --git a/include/UI.hpp b/include/UI.hpp
index e69de29..e4efea0 100644
--- a/include/UI.hpp
+++ b/include/UI.hpp
@@ -0,0 +1,22 @@
+#pragma once
+#include <SFML/Graphics.hpp>
+#include "Sorter.hpp"
+#include <string>
+
+class UI {
+public:
+    UI();
+    
+    void update(const Sorter& sorter, bool isPlaying, bool isFinished, float stepDelay, const Array& array);
+    void draw(sf::RenderWindow& window);
+
+private:
+    sf::Font font_;
+    sf::Text algorithmText_;
+    sf::Text stateText_;
+    sf::Text comparisonsText_;
+    sf::Text swapsText_;
+    sf::Text speedText_;
+    sf::Text controlsText_;
+    bool fontLoaded_;
+};
diff --git a/include/sorters/BubbleSorter.hpp b/include/sorters/BubbleSorter.hpp
index e69de29..2d8f8c4 100644
--- a/include/sorters/BubbleSorter.hpp
+++ b/include/sorters/BubbleSorter.hpp
@@ -0,0 +1,21 @@
+#pragma once
+#include "Sorter.hpp"
+
+class BubbleSorter : public Sorter {
+public:
+    BubbleSorter();
+    
+    void step(Array& array) override;
+    bool isFinished() const override;
+    std::string getName() const override;
+    void reset() override;
+
+private:
+    enum class Phase { COMPARING, SWAPPING, NEXT };
+    
+    int i_;
+    int j_;
+    int n_;
+    bool finished_;
+    Phase phase_;
+};
diff --git a/include/sorters/InsertionSorter.hpp b/include/sorters/InsertionSorter.hpp
index e69de29..b9ca211 100644
--- a/include/sorters/InsertionSorter.hpp
+++ b/include/sorters/InsertionSorter.hpp
@@ -0,0 +1,22 @@
+#pragma once
+#include "Sorter.hpp"
+
+class InsertionSorter : public Sorter {
+public:
+    InsertionSorter();
+    
+    void step(Array& array) override;
+    bool isFinished() const override;
+    std::string getName() const override;
+    void reset() override;
+
+private:
+    enum class Phase { COMPARING, SHIFTING, INSERTING, NEXT };
+    
+    int i_;
+    int j_;
+    int n_;
+    float key_;
+    bool finished_;
+    Phase phase_;
+};
diff --git a/include/sorters/MergeSorter.hpp b/include/sorters/MergeSorter.hpp
index e69de29..45ac940 100644
--- a/include/sorters/MergeSorter.hpp
+++ b/include/sorters/MergeSorter.hpp
@@ -0,0 +1,28 @@
+#pragma once
+#include "Sorter.hpp"
+#include <vector>
+
+class MergeSorter : public Sorter {
+public:
+    MergeSorter();
+    
+    void step(Array& array) override;
+    bool isFinished() const override;
+    std::string getName() const override;
+    void reset() override;
+
+private:
+    enum class Phase { MERGING, COPYING_LEFT, COPYING_RIGHT, COPYING_BACK, NEXT_MERGE };
+    
+    int currentSize_;
+    int leftStart_;
+    int mid_;
+    int rightEnd_;
+    int leftIndex_;
+    int rightIndex_;
+    int mergeIndex_;
+    std::vector<float> temp_;
+    bool finished_;
+    Phase phase_;
+    int n_;
+};
diff --git a/include/sorters/QuickSorter.hpp b/include/sorters/QuickSorter.hpp
index e69de29..5f6749f 100644
--- a/include/sorters/QuickSorter.hpp
+++ b/include/sorters/QuickSorter.hpp
@@ -0,0 +1,32 @@
+#pragma once
+#include "Sorter.hpp"
+#include <vector>
+
+class QuickSorter : public Sorter {
+public:
+    QuickSorter();
+    
+    void step(Array& array) override;
+    bool isFinished() const override;
+    std::string getName() const override;
+    void reset() override;
+
+private:
+    enum class Phase { PARTITIONING, SWAPPING_PIVOT, PUSHING_RANGES };
+    
+    struct Range {
+        int low;
+        int high;
+    };
+    
+    std::vector<Range> stack_;
+    int currentLow_;
+    int currentHigh_;
+    int pivotIndex_;
+    int i_;
+    int j_;
+    float pivotValue_;
+    bool finished_;
+    Phase phase_;
+    int n_;
+};
diff --git a/include/sorters/SelectionSorter.hpp b/include/sorters/SelectionSorter.hpp
index e69de29..a200fc9 100644
--- a/include/sorters/SelectionSorter.hpp
+++ b/include/sorters/SelectionSorter.hpp
@@ -0,0 +1,22 @@
+#pragma once
+#include "Sorter.hpp"
+
+class SelectionSorter : public Sorter {
+public:
+    SelectionSorter();
+    
+    void step(Array& array) override;
+    bool isFinished() const override;
+    std::string getName() const override;
+    void reset() override;
+
+private:
+    enum class Phase { FINDING_MIN, SWAPPING, NEXT };
+    
+    int i_;
+    int j_;
+    int minIndex_;
+    int n_;
+    bool finished_;
+    Phase phase_;
+};
diff --git a/src/App.cpp b/src/App.cpp
index feb83e0..5a714ed 100644
--- a/src/App.cpp
+++ b/src/App.cpp
@@ -1,7 +1,28 @@
 #include "App.hpp"
+#include "sorters/BubbleSorter.hpp"
+#include "sorters/SelectionSorter.hpp"
+#include "sorters/InsertionSorter.hpp"
+#include "sorters/MergeSorter.hpp"
+#include "sorters/QuickSorter.hpp"
 
-App::App() : window_(sf::VideoMode(1280, 720), "SortLab"), array_(100) {
-    window_.setFramerateLimit(60); 
+App::App() 
+    : window_(sf::VideoMode(1280, 720), "SortLab")
+    , array_(100)
+    , currentSorter_(std::make_unique<BubbleSorter>())
+    , ui_()
+    , isPlaying_(false)
+    , timeSinceLastStep_(0.0f)
+    , stepDelay_(0.01f)
+    , isSweeping_(false)
+    , sweepIndex_(0)
+    , sweepTimer_(0.0f)
+    , sweepDelay_(0.005f)
+    , lastComparisons_(0)
+    , lastSwaps_(0) {
+    window_.setFramerateLimit(60);
+    generateBeepSound();
+    beepSound_.setBuffer(beepBuffer_);
+    beepSound_.setVolume(15.0f);
 }
 
 void App::run() {
@@ -20,14 +41,129 @@ void App::handleEvents() {
         if (event.type == sf::Event::Closed) {
             window_.close();
         }
-        if (event.type == sf::Event::KeyPressed && event.key.code == sf::Keyboard::R) {
-            array_.shuffle();
+        
+        if (event.type == sf::Event::KeyPressed) {
+            switch (event.key.code) {
+                case sf::Keyboard::Space:
+                    isPlaying_ = !isPlaying_;
+                    break;
+                    
+                case sf::Keyboard::Right:
+                    if (!isPlaying_ && !currentSorter_->isFinished()) {
+                        currentSorter_->step(array_);
+                    }
+                    break;
+                    
+                case sf::Keyboard::Up:
+                    stepDelay_ = (stepDelay_ > 0.001f) ? stepDelay_ * 0.5f : 0.001f;
+                    if (stepDelay_ < 0.001f) stepDelay_ = 0.001f;
+                    break;
+                    
+                case sf::Keyboard::Down:
+                    stepDelay_ = (stepDelay_ < 0.5f) ? stepDelay_ * 2.0f : 0.5f;
+                    if (stepDelay_ > 0.5f) stepDelay_ = 0.5f;
+                    break;
+                    
+                case sf::Keyboard::Num1:
+                    switchSorter(std::make_unique<BubbleSorter>());
+                    break;
+                    
+                case sf::Keyboard::Num2:
+                    switchSorter(std::make_unique<SelectionSorter>());
+                    break;
+                    
+                case sf::Keyboard::Num3:
+                    switchSorter(std::make_unique<InsertionSorter>());
+                    break;
+                    
+                case sf::Keyboard::Num4:
+                    switchSorter(std::make_unique<MergeSorter>());
+                    break;
+                    
+                case sf::Keyboard::Num5:
+                    switchSorter(std::make_unique<QuickSorter>());
+                    break;
+                    
+                case sf::Keyboard::R:
+                    array_.shuffle();
+                    array_.resetStates();
+                    array_.resetCounters();
+                    currentSorter_->reset();
+                    isPlaying_ = false;
+                    timeSinceLastStep_ = 0.0f;
+                    isSweeping_ = false;
+                    sweepIndex_ = 0;
+                    lastComparisons_ = 0;
+                    lastSwaps_ = 0;
+                    break;
+                    
+                default:
+                    break;
+            }
         }
     }
 }
 
 void App::update(float dt) {
-   
+    ui_.update(*currentSorter_, isPlaying_, currentSorter_->isFinished(), stepDelay_, array_);
+    
+    if (isSweeping_) {
+        sweepTimer_ += dt;
+        
+        if (sweepTimer_ >= sweepDelay_) {
+            if (sweepIndex_ < array_.getSize()) {
+                array_.setState(sweepIndex_, Array::State::SORTED);
+                
+                float normalizedValue = array_.getValue(sweepIndex_) / static_cast<float>(array_.getSize());
+                float pitch = 0.5f + normalizedValue * 1.5f;
+                playBeep(pitch);
+                
+                sweepIndex_++;
+                sweepTimer_ = 0.0f;
+            } else {
+                isSweeping_ = false;
+            }
+        }
+        return;
+    }
+    
+    if (isPlaying_ && !currentSorter_->isFinished()) {
+        timeSinceLastStep_ += dt;
+        
+        if (timeSinceLastStep_ >= stepDelay_) {
+            size_t beforeComparisons = array_.getComparisons();
+            size_t beforeSwaps = array_.getSwaps();
+            
+            currentSorter_->step(array_);
+            
+            size_t afterComparisons = array_.getComparisons();
+            size_t afterSwaps = array_.getSwaps();
+            
+            if (afterComparisons > beforeComparisons || afterSwaps > beforeSwaps) {
+                float avgPitch = 1.0f;
+                
+                for (int i = 0; i < array_.getSize(); ++i) {
+                    if (array_.getState(i) == Array::State::COMPARE || 
+                        array_.getState(i) == Array::State::SWAP) {
+                        float normalizedValue = array_.getValue(i) / static_cast<float>(array_.getSize());
+                        avgPitch = 0.5f + normalizedValue * 1.5f;
+                        break;
+                    }
+                }
+                
+                playBeep(avgPitch);
+            }
+            
+            timeSinceLastStep_ = 0.0f;
+            
+            if (currentSorter_->isFinished()) {
+                array_.resetStates();
+                isSweeping_ = true;
+                sweepIndex_ = 0;
+                sweepTimer_ = 0.0f;
+            }
+        }
+    }
 }
 
 void App::render() {
@@ -52,5 +188,20 @@ void App::render() {
         window_.draw(bar);
     }
 
+    ui_.draw(window_);
+    
     window_.display();
 }
+
+void App::switchSorter(std::unique_ptr<Sorter> newSorter) {
+    currentSorter_ = std::move(newSorter);
+    array_.shuffle();
+    array_.resetStates();
+    array_.resetCounters();
+    isPlaying_ = false;
+    timeSinceLastStep_ = 0.0f;
+    isSweeping_ = false;
+    sweepIndex_ = 0;
+    lastComparisons_ = 0;
+    lastSwaps_ = 0;
+}
diff --git a/src/App_audio.cpp b/src/App_audio.cpp
new file mode 100644
index 0000000..c054824
--- /dev/null
+++ b/src/App_audio.cpp
@@ -0,0 +1,30 @@
+#include "App.hpp"
+#include <cmath>
+#include <vector>
+
+void App::generateBeepSound() {
+    const unsigned int sampleRate = 44100;
+    const float duration = 0.02f;
+    const unsigned int sampleCount = static_cast<unsigned int>(sampleRate * duration);
+    
+    std::vector<sf::Int16> samples(sampleCount);
+    
+    const float frequency = 440.0f;
+    const float amplitude = 3000.0f;
+    
+    for (unsigned int i = 0; i < sampleCount; ++i) {
+        float t = static_cast<float>(i) / sampleRate;
+        float envelope = 1.0f - (t / duration);
+        float value = amplitude * envelope * std::sin(2.0f * 3.14159f * frequency * t);
+        samples[i] = static_cast<sf::Int16>(value);
+    }
+    
+    beepBuffer_.loadFromSamples(samples.data(), sampleCount, 1, sampleRate);
+}
+
+void App::playBeep(float pitch) {
+    if (beepSound_.getStatus() != sf::Sound::Playing) {
+        beepSound_.setPitch(pitch);
+        beepSound_.play();
+    }
+}
diff --git a/src/Array.cpp b/src/Array.cpp
index ecdd2d9..04770ee 100644
--- a/src/Array.cpp
+++ b/src/Array.cpp
@@ -1,6 +1,8 @@
 #include "Array.hpp"
+#include <random>
+#include <algorithm>
 
-Array::Array(int size) {
+Array::Array(int size) : comparisons_(0), swaps_(0) {
     data_.resize(size);
     states_.resize(size, State::NORMAL);
     shuffle();
@@ -28,3 +30,24 @@ void Array::setState(int index, State state) { states_[index] = state; }
 void Array::resetStates() {
     std::fill(states_.begin(), states_.end(), State::NORMAL);
 }
+
+void Array::resetCounters() {
+    comparisons_ = 0;
+    swaps_ = 0;
+}
+
+size_t Array::getComparisons() const {
+    return comparisons_;
+}
+
+size_t Array::getSwaps() const {
+    return swaps_;
+}
+
+void Array::incrementComparisons() {
+    comparisons_++;
+}
+
+void Array::incrementSwaps() {
+    swaps_++;
+}
diff --git a/src/Sorter.cpp b/src/Sorter.cpp
index e69de29..a4af018 100644
--- a/src/Sorter.cpp
+++ b/src/Sorter.cpp
@@ -0,0 +1 @@
+#include "Sorter.hpp"
diff --git a/src/UI.cpp b/src/UI.cpp
index e69de29..702f7e3 100644
--- a/src/UI.cpp
+++ b/src/UI.cpp
@@ -0,0 +1,82 @@
+#include "UI.hpp"
+#include <iostream>
+
+UI::UI() : fontLoaded_(false) {
+    if (!font_.loadFromFile("assets/fonts/Roboto-Regular.ttf")) {
+        std::cerr << "Failed to load font" << std::endl;
+        return;
+    }
+    
+    fontLoaded_ = true;
+    
+    algorithmText_.setFont(font_);
+    algorithmText_.setCharacterSize(24);
+    algorithmText_.setFillColor(sf::Color::White);
+    algorithmText_.setPosition(20.0f, 20.0f);
+    
+    stateText_.setFont(font_);
+    stateText_.setCharacterSize(20);
+    stateText_.setFillColor(sf::Color::White);
+    stateText_.setPosition(20.0f, 55.0f);
+    
+    comparisonsText_.setFont(font_);
+    comparisonsText_.setCharacterSize(18);
+    comparisonsText_.setFillColor(sf::Color(200, 200, 200));
+    comparisonsText_.setPosition(20.0f, 90.0f);
+    
+    swapsText_.setFont(font_);
+    swapsText_.setCharacterSize(18);
+    swapsText_.setFillColor(sf::Color(200, 200, 200));
+    swapsText_.setPosition(20.0f, 115.0f);
+    
+    speedText_.setFont(font_);
+    speedText_.setCharacterSize(18);
+    speedText_.setFillColor(sf::Color(200, 200, 200));
+    speedText_.setPosition(20.0f, 140.0f);
+    
+    controlsText_.setFont(font_);
+    controlsText_.setCharacterSize(14);
+    controlsText_.setFillColor(sf::Color(150, 150, 150));
+    controlsText_.setPosition(20.0f, 175.0f);
+    controlsText_.setString("[1-5] Algorithms  [Space] Play/Pause  [Right] Step  [Up/Down] Speed  [R] Shuffle");
+}
+
+void UI::update(const Sorter& sorter, bool isPlaying, bool isFinished, float stepDelay, const Array& array) {
+    if (!fontLoaded_) {
+        return;
+    }
+    
+    algorithmText_.setString("Algorithm: " + sorter.getName());
+    
+    std::string state;
+    if (isFinished) {
+        state = "Status: Finished";
+        stateText_.setFillColor(sf::Color::Green);
+    } else if (isPlaying) {
+        state = "Status: Playing";
+        stateText_.setFillColor(sf::Color::Yellow);
+    } else {
+        state = "Status: Paused";
+        stateText_.setFillColor(sf::Color::White);
+    }
+    stateText_.setString(state);
+    
+    comparisonsText_.setString("Comparisons: " + std::to_string(array.getComparisons()));
+    swapsText_.setString("Swaps: " + std::to_string(array.getSwaps()));
+    
+    int delayMs = static_cast<int>(stepDelay * 1000.0f);
+    speedText_.setString("Delay: " + std::to_string(delayMs) + "ms");
+}
+
+void UI::draw(sf::RenderWindow& window) {
+    if (!fontLoaded_) {
+        return;
+    }
+    
+    window.draw(algorithmText_);
+    window.draw(stateText_);
+    window.draw(comparisonsText_);
+    window.draw(swapsText_);
+    window.draw(speedText_);
+    window.draw(controlsText_);
+}
diff --git a/src/sorters/BubbleSorter.cpp b/src/sorters/BubbleSorter.cpp
index e69de29..4bdd452 100644
--- a/src/sorters/BubbleSorter.cpp
+++ b/src/sorters/BubbleSorter.cpp
@@ -0,0 +1,72 @@
+#include "sorters/BubbleSorter.hpp"
+
+BubbleSorter::BubbleSorter() 
+    : i_(0), j_(0), n_(0), finished_(false), phase_(Phase::COMPARING) {
+}
+
+void BubbleSorter::step(Array& array) {
+    if (finished_) {
+        return;
+    }
+    
+    if (n_ == 0) {
+        n_ = array.getSize();
+    }
+    
+    if (phase_ == Phase::COMPARING) {
+        if (j_ >= n_ - i_ - 1) {
+            i_++;
+            j_ = 0;
+            
+            if (i_ >= n_ - 1) {
+                array.resetStates();
+                for (int k = 0; k < n_; ++k) {
+                    array.setState(k, Array::State::SORTED);
+                }
+                finished_ = true;
+                return;
+            }
+        }
+        
+        array.resetStates();
+        array.setState(j_, Array::State::COMPARE);
+        array.setState(j_ + 1, Array::State::COMPARE);
+        
+        array.incrementComparisons();
+        
+        if (array.getValue(j_) > array.getValue(j_ + 1)) {
+            phase_ = Phase::SWAPPING;
+        } else {
+            phase_ = Phase::NEXT;
+        }
+    } else if (phase_ == Phase::SWAPPING) {
+        array.setState(j_, Array::State::SWAP);
+        array.setState(j_ + 1, Array::State::SWAP);
+        
+        float temp = array.getValue(j_);
+        array.setValue(j_, array.getValue(j_ + 1));
+        array.setValue(j_ + 1, temp);
+        
+        array.incrementSwaps();
+        phase_ = Phase::NEXT;
+    } else if (phase_ == Phase::NEXT) {
+        j_++;
+        phase_ = Phase::COMPARING;
+    }
+}
+
+bool BubbleSorter::isFinished() const {
+    return finished_;
+}
+
+std::string BubbleSorter::getName() const {
+    return "Bubble Sort";
+}
+
+void BubbleSorter::reset() {
+    i_ = 0;
+    j_ = 0;
+    n_ = 0;
+    finished_ = false;
+    phase_ = Phase::COMPARING;
+}
diff --git a/src/sorters/InsertionSorter.cpp b/src/sorters/InsertionSorter.cpp
index e69de29..b2aad41 100644
--- a/src/sorters/InsertionSorter.cpp
+++ b/src/sorters/InsertionSorter.cpp
@@ -0,0 +1,77 @@
+#include "sorters/InsertionSorter.hpp"
+
+InsertionSorter::InsertionSorter()
+    : i_(1), j_(0), n_(0), key_(0.0f), finished_(false), phase_(Phase::COMPARING) {
+}
+
+void InsertionSorter::step(Array& array) {
+    if (finished_) {
+        return;
+    }
+    
+    if (n_ == 0) {
+        n_ = array.getSize();
+        array.setState(0, Array::State::SORTED);
+    }
+    
+    if (phase_ == Phase::COMPARING) {
+        if (i_ >= n_) {
+            array.resetStates();
+            for (int k = 0; k < n_; ++k) {
+                array.setState(k, Array::State::SORTED);
+            }
+            finished_ = true;
+            return;
+        }
+        
+        key_ = array.getValue(i_);
+        j_ = i_ - 1;
+        phase_ = Phase::SHIFTING;
+    } else if (phase_ == Phase::SHIFTING) {
+        if (j_ >= 0) {
+            array.resetStates();
+            array.setState(j_, Array::State::COMPARE);
+            array.setState(j_ + 1, Array::State::SWAP);
+            
+            array.incrementComparisons();
+            
+            if (array.getValue(j_) > key_) {
+                array.setValue(j_ + 1, array.getValue(j_));
+                array.incrementSwaps();
+                j_--;
+            } else {
+                phase_ = Phase::INSERTING;
+            }
+        } else {
+            phase_ = Phase::INSERTING;
+        }
+    } else if (phase_ == Phase::INSERTING) {
+        array.setValue(j_ + 1, key_);
+        
+        for (int k = 0; k <= i_; ++k) {
+            array.setState(k, Array::State::SORTED);
+        }
+        
+        phase_ = Phase::NEXT;
+    } else if (phase_ == Phase::NEXT) {
+        i_++;
+        phase_ = Phase::COMPARING;
+    }
+}
+
+bool InsertionSorter::isFinished() const {
+    return finished_;
+}
+
+std::string InsertionSorter::getName() const {
+    return "Insertion Sort";
+}
+
+void InsertionSorter::reset() {
+    i_ = 1;
+    j_ = 0;
+    n_ = 0;
+    key_ = 0.0f;
+    finished_ = false;
+    phase_ = Phase::COMPARING;
+}
diff --git a/src/sorters/MergeSorter.cpp b/src/sorters/MergeSorter.cpp
index e69de29..0ea130a 100644
--- a/src/sorters/MergeSorter.cpp
+++ b/src/sorters/MergeSorter.cpp
@@ -0,0 +1,136 @@
+#include "sorters/MergeSorter.hpp"
+
+MergeSorter::MergeSorter()
+    : currentSize_(1), leftStart_(0), mid_(0), rightEnd_(0)
+    , leftIndex_(0), rightIndex_(0), mergeIndex_(0)
+    , finished_(false), phase_(Phase::MERGING), n_(0) {
+}
+
+void MergeSorter::step(Array& array) {
+    if (finished_) {
+        return;
+    }
+    
+    if (n_ == 0) {
+        n_ = array.getSize();
+        temp_.resize(n_);
+    }
+    
+    if (currentSize_ >= n_) {
+        array.resetStates();
+        for (int k = 0; k < n_; ++k) {
+            array.setState(k, Array::State::SORTED);
+        }
+        finished_ = true;
+        return;
+    }
+    
+    if (phase_ == Phase::MERGING) {
+        if (leftStart_ >= n_ - 1) {
+            currentSize_ *= 2;
+            leftStart_ = 0;
+            return;
+        }
+        
+        mid_ = leftStart_ + currentSize_ - 1;
+        rightEnd_ = (leftStart_ + 2 * currentSize_ - 1 < n_ - 1) 
+                    ? leftStart_ + 2 * currentSize_ - 1 
+                    : n_ - 1;
+        
+        if (mid_ >= n_) {
+            mid_ = n_ - 1;
+        }
+        
+        leftIndex_ = leftStart_;
+        rightIndex_ = mid_ + 1;
+        mergeIndex_ = 0;
+        
+        for (int k = leftStart_; k <= rightEnd_; ++k) {
+            temp_[mergeIndex_++] = array.getValue(k);
+        }
+        
+        leftIndex_ = 0;
+        rightIndex_ = mid_ - leftStart_ + 1;
+        mergeIndex_ = leftStart_;
+        
+        phase_ = Phase::COPYING_BACK;
+    } else if (phase_ == Phase::COPYING_BACK) {
+        int leftEnd = mid_ - leftStart_;
+        int rightEndLocal = rightEnd_ - leftStart_;
+        
+        if (leftIndex_ <= leftEnd && rightIndex_ <= rightEndLocal) {
+            array.resetStates();
+            array.setState(mergeIndex_, Array::State::SWAP);
+            array.setState(leftStart_ + leftIndex_, Array::State::COMPARE);
+            array.setState(leftStart_ + rightIndex_, Array::State::COMPARE);
+            
+            array.incrementComparisons();
+            
+            if (temp_[leftIndex_] <= temp_[rightIndex_]) {
+                array.setValue(mergeIndex_, temp_[leftIndex_]);
+                leftIndex_++;
+            } else {
+                array.setValue(mergeIndex_, temp_[rightIndex_]);
+                rightIndex_++;
+            }
+            
+            array.incrementSwaps();
+            mergeIndex_++;
+        } else {
+            phase_ = Phase::COPYING_LEFT;
+        }
+    } else if (phase_ == Phase::COPYING_LEFT) {
+        int leftEnd = mid_ - leftStart_;
+        
+        if (leftIndex_ <= leftEnd) {
+            array.resetStates();
+            array.setState(mergeIndex_, Array::State::SWAP);
+            
+            array.setValue(mergeIndex_, temp_[leftIndex_]);
+            leftIndex_++;
+            mergeIndex_++;
+            array.incrementSwaps();
+        } else {
+            phase_ = Phase::COPYING_RIGHT;
+        }
+    } else if (phase_ == Phase::COPYING_RIGHT) {
+        int rightEndLocal = rightEnd_ - leftStart_;
+        
+        if (rightIndex_ <= rightEndLocal) {
+            array.resetStates();
+            array.setState(mergeIndex_, Array::State::SWAP);
+            
+            array.setValue(mergeIndex_, temp_[rightIndex_]);
+            rightIndex_++;
+            mergeIndex_++;
+            array.incrementSwaps();
+        } else {
+            phase_ = Phase::NEXT_MERGE;
+        }
+    } else if (phase_ == Phase::NEXT_MERGE) {
+        leftStart_ += 2 * currentSize_;
+        phase_ = Phase::MERGING;
+    }
+}
+
+bool MergeSorter::isFinished() const {
+    return finished_;
+}
+
+std::string MergeSorter::getName() const {
+    return "Merge Sort";
+}
+
+void MergeSorter::reset() {
+    currentSize_ = 1;
+    leftStart_ = 0;
+    mid_ = 0;
+    rightEnd_ = 0;
+    leftIndex_ = 0;
+    rightIndex_ = 0;
+    mergeIndex_ = 0;
+    temp_.clear();
+    finished_ = false;
+    phase_ = Phase::MERGING;
+    n_ = 0;
+}
diff --git a/src/sorters/QuickSorter.cpp b/src/sorters/QuickSorter.cpp
index e69de29..3888fc9 100644
--- a/src/sorters/QuickSorter.cpp
+++ b/src/sorters/QuickSorter.cpp
@@ -0,0 +1,122 @@
+#include "sorters/QuickSorter.hpp"
+
+QuickSorter::QuickSorter()
+    : currentLow_(0), currentHigh_(0), pivotIndex_(0), i_(0), j_(0)
+    , pivotValue_(0.0f), finished_(false), phase_(Phase::PARTITIONING), n_(0) {
+}
+
+void QuickSorter::step(Array& array) {
+    if (finished_) {
+        return;
+    }
+    
+    if (n_ == 0) {
+        n_ = array.getSize();
+        stack_.push_back({0, n_ - 1});
+    }
+    
+    if (stack_.empty()) {
+        array.resetStates();
+        for (int k = 0; k < n_; ++k) {
+            array.setState(k, Array::State::SORTED);
+        }
+        finished_ = true;
+        return;
+    }
+    
+    if (phase_ == Phase::PARTITIONING) {
+        if (j_ == currentLow_) {
+            Range range = stack_.back();
+            stack_.pop_back();
+            
+            if (range.low >= range.high) {
+                if (stack_.empty()) {
+                    array.resetStates();
+                    for (int k = 0; k < n_; ++k) {
+                        array.setState(k, Array::State::SORTED);
+                    }
+                    finished_ = true;
+                }
+                return;
+            }
+            
+            currentLow_ = range.low;
+            currentHigh_ = range.high;
+            pivotIndex_ = currentHigh_;
+            pivotValue_ = array.getValue(pivotIndex_);
+            i_ = currentLow_ - 1;
+            j_ = currentLow_;
+        }
+        
+        if (j_ < currentHigh_) {
+            array.resetStates();
+            array.setState(j_, Array::State::COMPARE);
+            array.setState(pivotIndex_, Array::State::SWAP);
+            
+            array.incrementComparisons();
+            
+            if (array.getValue(j_) < pivotValue_) {
+                i_++;
+                
+                if (i_ != j_) {
+                    array.setState(i_, Array::State::SWAP);
+                    
+                    float temp = array.getValue(i_);
+                    array.setValue(i_, array.getValue(j_));
+                    array.setValue(j_, temp);
+                    
+                    array.incrementSwaps();
+                }
+            }
+            
+            j_++;
+        } else {
+            phase_ = Phase::SWAPPING_PIVOT;
+        }
+    } else if (phase_ == Phase::SWAPPING_PIVOT) {
+        array.resetStates();
+        array.setState(i_ + 1, Array::State::SWAP);
+        array.setState(pivotIndex_, Array::State::SWAP);
+        
+        float temp = array.getValue(i_ + 1);
+        array.setValue(i_ + 1, array.getValue(pivotIndex_));
+        array.setValue(pivotIndex_, temp);
+        
+        array.incrementSwaps();
+        pivotIndex_ = i_ + 1;
+        
+        phase_ = Phase::PUSHING_RANGES;
+    } else if (phase_ == Phase::PUSHING_RANGES) {
+        if (pivotIndex_ - 1 > currentLow_) {
+            stack_.push_back({currentLow_, pivotIndex_ - 1});
+        }
+        
+        if (pivotIndex_ + 1 < currentHigh_) {
+            stack_.push_back({pivotIndex_ + 1, currentHigh_});
+        }
+        
+        j_ = currentLow_;
+        phase_ = Phase::PARTITIONING;
+    }
+}
+
+bool QuickSorter::isFinished() const {
+    return finished_;
+}
+
+std::string QuickSorter::getName() const {
+    return "Quick Sort";
+}
+
+void QuickSorter::reset() {
+    stack_.clear();
+    currentLow_ = 0;
+    currentHigh_ = 0;
+    pivotIndex_ = 0;
+    i_ = 0;
+    j_ = 0;
+    pivotValue_ = 0.0f;
+    finished_ = false;
+    phase_ = Phase::PARTITIONING;
+    n_ = 0;
+}
diff --git a/src/sorters/SelectionSorter.cpp b/src/sorters/SelectionSorter.cpp
index e69de29..10bdf0b 100644
--- a/src/sorters/SelectionSorter.cpp
+++ b/src/sorters/SelectionSorter.cpp
@@ -0,0 +1,86 @@
+#include "sorters/SelectionSorter.hpp"
+
+SelectionSorter::SelectionSorter()
+    : i_(0), j_(0), minIndex_(0), n_(0), finished_(false), phase_(Phase::FINDING_MIN) {
+}
+
+void SelectionSorter::step(Array& array) {
+    if (finished_) {
+        return;
+    }
+    
+    if (n_ == 0) {
+        n_ = array.getSize();
+        minIndex_ = 0;
+    }
+    
+    if (phase_ == Phase::FINDING_MIN) {
+        if (j_ == i_) {
+            minIndex_ = i_;
+            j_++;
+        }
+        
+        if (j_ < n_) {
+            array.resetStates();
+            array.setState(i_, Array::State::COMPARE);
+            array.setState(j_, Array::State::COMPARE);
+            array.setState(minIndex_, Array::State::SWAP);
+            
+            array.incrementComparisons();
+            
+            if (array.getValue(j_) < array.getValue(minIndex_)) {
+                minIndex_ = j_;
+            }
+            
+            j_++;
+        } else {
+            phase_ = Phase::SWAPPING;
+        }
+    } else if (phase_ == Phase::SWAPPING) {
+        if (minIndex_ != i_) {
+            array.resetStates();
+            array.setState(i_, Array::State::SWAP);
+            array.setState(minIndex_, Array::State::SWAP);
+            
+            float temp = array.getValue(i_);
+            array.setValue(i_, array.getValue(minIndex_));
+            array.setValue(minIndex_, temp);
+            
+            array.incrementSwaps();
+        }
+        
+        array.setState(i_, Array::State::SORTED);
+        phase_ = Phase::NEXT;
+    } else if (phase_ == Phase::NEXT) {
+        i_++;
+        
+        if (i_ >= n_ - 1) {
+            array.resetStates();
+            for (int k = 0; k < n_; ++k) {
+                array.setState(k, Array::State::SORTED);
+            }
+            finished_ = true;
+            return;
+        }
+        
+        j_ = i_;
+        phase_ = Phase::FINDING_MIN;
+    }
+}
+
+bool SelectionSorter::isFinished() const {
+    return finished_;
+}
+
+std::string SelectionSorter::getName() const {
+    return "Selection Sort";
+}
+
+void SelectionSorter::reset() {
+    i_ = 0;
+    j_ = 0;
+    minIndex_ = 0;
+    n_ = 0;
+    finished_ = false;
+    phase_ = Phase::FINDING_MIN;
+}