diff --git a/data/config/keybinds/layout0.bin b/data/config/keybinds/layout0.bin
index e69de29..6b4afd4 100644
Binary files a/data/config/keybinds/layout0.bin and b/data/config/keybinds/layout0.bin differ
diff --git a/data/config/keybinds/layout1.bin b/data/config/keybinds/layout1.bin
index e69de29..9d7738e 100644
Binary files a/data/config/keybinds/layout1.bin and b/data/config/keybinds/layout1.bin differ
diff --git a/data/config/keybinds/layout2.bin b/data/config/keybinds/layout2.bin
index e69de29..deae4e8 100644
Binary files a/data/config/keybinds/layout2.bin and b/data/config/keybinds/layout2.bin differ
diff --git a/data/config/keybinds/layout3.bin b/data/config/keybinds/layout3.bin
index e69de29..a6eddc0 100644
Binary files a/data/config/keybinds/layout3.bin and b/data/config/keybinds/layout3.bin differ
diff --git a/data/config/keybinds/layout4.bin b/data/config/keybinds/layout4.bin
index e69de29..2a0b30e 100644
Binary files a/data/config/keybinds/layout4.bin and b/data/config/keybinds/layout4.bin differ
diff --git a/data/config/settings.bin b/data/config/settings.bin
index e69de29..4a6fcc7 100644
Binary files a/data/config/settings.bin and b/data/config/settings.bin differ
diff --git a/src/Core/Menu.h b/src/Core/Menu.h
index 688338e..aea2c96 100644
--- a/src/Core/Menu.h
+++ b/src/Core/Menu.h
@@ -5,7 +5,6 @@
 #include "Game.h"
 
 static const int FRAMES_PER_SECOND = 60;   // the number of frames per second, all the values in the app were choosen with this number in mind
-static const int MAXIMUM_PIECES_SIZE = 15; // the maximum size of available pieces
 
 
 /**
diff --git a/src/GraphicalUI/AppMenus/AppMenu.h b/src/GraphicalUI/AppMenus/AppMenu.h
index 1302f87..57b7aec 100644
--- a/src/GraphicalUI/AppMenus/AppMenu.h
+++ b/src/GraphicalUI/AppMenus/AppMenu.h
@@ -6,15 +6,18 @@
 #include <memory>
 #include <SFML/Graphics.hpp>
 
+class AppMenu;
+using MenuStack = std::stack<std::shared_ptr<AppMenu>>;
+
 
 class AppMenu {
     protected:
-        std::shared_ptr<std::stack<AppMenu>> menuStack;
+        std::shared_ptr<MenuStack> menuStack;
         std::shared_ptr<Settings> settings;
         std::shared_ptr<sf::RenderWindow> renderWindow;
     
     public:
-        AppMenu(std::shared_ptr<std::stack<AppMenu>> menuStack, std::shared_ptr<Settings> settings, std::shared_ptr<sf::RenderWindow> renderWindow) :
+        AppMenu(std::shared_ptr<MenuStack> menuStack, std::shared_ptr<Settings> settings, std::shared_ptr<sf::RenderWindow> renderWindow) :
             menuStack(menuStack),
             settings(settings),
             renderWindow(renderWindow)
diff --git a/src/GraphicalUI/AppMenus/InGameAppMenu.cpp b/src/GraphicalUI/AppMenus/InGameAppMenu.cpp
index 369c471..fc14b08 100644
--- a/src/GraphicalUI/AppMenus/InGameAppMenu.cpp
+++ b/src/GraphicalUI/AppMenus/InGameAppMenu.cpp
@@ -7,7 +7,7 @@
 #include <SFML/Graphics.hpp>
 
 
-InGameAppMenu::InGameAppMenu(std::shared_ptr<std::stack<AppMenu>> menuStack, std::shared_ptr<Settings> settings, std::shared_ptr<sf::RenderWindow> renderWindow) :
+InGameAppMenu::InGameAppMenu(std::shared_ptr<MenuStack> menuStack, std::shared_ptr<Settings> settings, std::shared_ptr<sf::RenderWindow> renderWindow) :
     AppMenu(menuStack, settings, renderWindow),
     game(this->settings->getMenu().startGame(this->settings->getGamemode()))
     {
diff --git a/src/GraphicalUI/AppMenus/InGameAppMenu.h b/src/GraphicalUI/AppMenus/InGameAppMenu.h
index 04b29d4..ec31ffb 100644
--- a/src/GraphicalUI/AppMenus/InGameAppMenu.h
+++ b/src/GraphicalUI/AppMenus/InGameAppMenu.h
@@ -13,7 +13,7 @@ class InGameAppMenu : public AppMenu {
         bool paused;
 
     public:
-        InGameAppMenu(std::shared_ptr<std::stack<AppMenu>> menuStack, std::shared_ptr<Settings> settings, std::shared_ptr<sf::RenderWindow> renderWindow);
+        InGameAppMenu(std::shared_ptr<MenuStack> menuStack, std::shared_ptr<Settings> settings, std::shared_ptr<sf::RenderWindow> renderWindow);
 
         void computeFrame();
 
diff --git a/src/GraphicalUI/AppMenus/MainAppMenu.cpp b/src/GraphicalUI/AppMenus/MainAppMenu.cpp
index 73a3e8b..d9cad52 100644
--- a/src/GraphicalUI/AppMenus/MainAppMenu.cpp
+++ b/src/GraphicalUI/AppMenus/MainAppMenu.cpp
@@ -8,14 +8,14 @@
 #include <SFML/Graphics.hpp>
 
 
-MainAppMenu::MainAppMenu(std::shared_ptr<std::stack<AppMenu>> menuStack, std::shared_ptr<Settings> settings, std::shared_ptr<sf::RenderWindow> renderWindow) :
+MainAppMenu::MainAppMenu(std::shared_ptr<MenuStack> menuStack, std::shared_ptr<Settings> settings, std::shared_ptr<sf::RenderWindow> renderWindow) :
     AppMenu(menuStack, settings, renderWindow) {
 
 }
 
 void MainAppMenu::computeFrame() {
     if (sf::Keyboard::isKeyPressed(sfKey::Enter)) {
-        this->menuStack->push(InGameAppMenu(this->menuStack, this->settings, this->renderWindow));
+        this->menuStack->push(std::make_shared<InGameAppMenu>(this->menuStack, this->settings, this->renderWindow));
     }
     else if (sf::Keyboard::isKeyPressed(sfKey::Escape)) {
         this->menuStack->pop();
diff --git a/src/GraphicalUI/AppMenus/MainAppMenu.h b/src/GraphicalUI/AppMenus/MainAppMenu.h
index 1f48733..6731717 100644
--- a/src/GraphicalUI/AppMenus/MainAppMenu.h
+++ b/src/GraphicalUI/AppMenus/MainAppMenu.h
@@ -9,7 +9,7 @@
 
 class MainAppMenu : public AppMenu {
     public:
-        MainAppMenu(std::shared_ptr<std::stack<AppMenu>> menuStack, std::shared_ptr<Settings> settings, std::shared_ptr<sf::RenderWindow> renderWindow);
+        MainAppMenu(std::shared_ptr<MenuStack> menuStack, std::shared_ptr<Settings> settings, std::shared_ptr<sf::RenderWindow> renderWindow);
 
         void computeFrame();
 
diff --git a/src/GraphicalUI/GraphApp.cpp b/src/GraphicalUI/GraphApp.cpp
index ba7eff2..d134026 100644
--- a/src/GraphicalUI/GraphApp.cpp
+++ b/src/GraphicalUI/GraphApp.cpp
@@ -13,19 +13,19 @@ static const double TIME_BETWEEN_FRAMES = (1000.f / FRAMES_PER_SECOND);
 
 GraphApp::GraphApp() {
     this->settings = std::make_shared<Settings>();
-    this->menuStack = std::make_shared<std::stack<AppMenu>>();
-    this->window = std::make_shared<sf::RenderWindow>();
+    this->menuStack = std::make_shared<MenuStack>();
+    this->renderWindow = std::make_shared<sf::RenderWindow>();
 }
 
 void GraphApp::run() {
-    changeVideoMode(*this->window, this->settings->getVideoMode());
-    this->menuStack->push(MainAppMenu(this->menuStack, this->settings, this->window));
+    changeVideoMode(*this->renderWindow, this->settings->getVideoMode());
+    this->menuStack->push(std::make_shared<MainAppMenu>(this->menuStack, this->settings, this->renderWindow));
 
     bool quit = false;
     double timeAtNextFrame = 0;
     sf::Clock clock;
     while (!quit) {
-        while (const std::optional event = this->window->pollEvent()) {
+        while (const std::optional event = this->renderWindow->pollEvent()) {
             if (event->is<sf::Event::Closed>()) {
                 quit = true;
             }
@@ -34,16 +34,16 @@ void GraphApp::run() {
         if (!quit) {
             if (clock.getElapsedTime().asMilliseconds() > timeAtNextFrame) {
                 timeAtNextFrame += TIME_BETWEEN_FRAMES;
-                this->menuStack->top().computeFrame();
+                this->menuStack->top()->computeFrame();
 
                 if (this->menuStack->empty()) {
                     quit = true;
                 }
                 else {
-                    this->menuStack->top().drawFrame();
+                    this->menuStack->top()->drawFrame();
                 }
             }
         }   
     }
-    window->close();
+    renderWindow->close();
 }
diff --git a/src/GraphicalUI/GraphApp.h b/src/GraphicalUI/GraphApp.h
index effaac8..4f2c694 100644
--- a/src/GraphicalUI/GraphApp.h
+++ b/src/GraphicalUI/GraphApp.h
@@ -11,8 +11,8 @@
 class GraphApp {
     private:
         std::shared_ptr<Settings> settings;
-        std::shared_ptr<std::stack<AppMenu>> menuStack;
-        std::shared_ptr<sf::RenderWindow> window;
+        std::shared_ptr<MenuStack> menuStack;
+        std::shared_ptr<sf::RenderWindow> renderWindow;
     
     public:
         GraphApp();
diff --git a/src/GraphicalUI/Keybinds.cpp b/src/GraphicalUI/Keybinds.cpp
new file mode 100644
index 0000000..9b6ac5c
--- /dev/null
+++ b/src/GraphicalUI/Keybinds.cpp
@@ -0,0 +1,81 @@
+#include "Keybinds.h"
+
+#include "../Core/Action.h"
+
+#include <map>
+#include <set>
+#include <fstream>
+#include <SFML/Graphics.hpp>
+
+
+Keybinds::Keybinds(int layoutNumber) :
+    layoutNumber(layoutNumber) {
+
+    for (Action action : ACTION_LIST_IN_ORDER) {
+        this->keybinds.insert({action, std::set<sfKey>()});
+    }
+
+    this->loadKeybindsFromFile();
+}
+
+void Keybinds::loadKeybindsFromFile() {
+    std::ifstream layoutFile("data/config/keybinds/layout" + std::to_string(this->layoutNumber) + ".bin", std::ios::binary);
+
+    for (Action action : ACTION_LIST_IN_ORDER) {
+        this->keybinds.at(action).clear();
+    }
+
+    char byte;
+    while (layoutFile.get(&byte, 1)) {
+        Action action = Action(byte);
+
+        do {
+            layoutFile.get(&byte, 1);
+            if (byte != 0xFF) {
+                this->keybinds.at(action).insert(sfKey(byte));
+            }
+        } while (byte != 0xFF);
+    }
+}
+
+void Keybinds::saveKeybindsToFile() const {
+    std::ofstream layoutFile("data/config/keybinds/layout" + std::to_string(this->layoutNumber) + ".bin", std::ios::trunc | std::ios::binary);
+
+    char byte;
+    for (Action action : ACTION_LIST_IN_ORDER) {
+        byte = action;
+        layoutFile.write(&byte, 1);
+
+        for (sfKey key : this->keybinds.at(action)) {
+            byte = (int) key;
+            layoutFile.write(&byte, 1);
+        }
+        
+        byte = 0xFF;
+        layoutFile.write(&byte, 1);
+    }
+}
+
+void Keybinds::addKey(Action action, sfKey key) {
+    this->keybinds.at(action).insert(key);
+}
+
+void Keybinds::clearKeys(Action action) {
+    this->keybinds.at(action).clear();
+}
+
+const std::set<Action> Keybinds::getActions(sfKey key) const {
+    std::set<Action> actions;
+
+    for (const auto& [action, keys] : this->keybinds) {
+        if (keys.contains(key)) {
+            actions.insert(action);
+        }
+    }
+
+    return actions;
+}
+
+const std::set<sfKey>& Keybinds::getKeybinds(Action action) const {
+    return this->keybinds.at(action);
+}
diff --git a/src/GraphicalUI/Keybinds.h b/src/GraphicalUI/Keybinds.h
index 4c62f4c..e219520 100644
--- a/src/GraphicalUI/Keybinds.h
+++ b/src/GraphicalUI/Keybinds.h
@@ -3,7 +3,7 @@
 #include "../Core/Action.h"
 
 #include <map>
-#include <vector>
+#include <set>
 #include <SFML/Graphics.hpp>
 
 using sfKey = sf::Keyboard::Key;
@@ -14,7 +14,7 @@ static const int CUSTOMIZABLE_KEYBINDS = NUMBER_OF_KEYBINDS - 1;
 
 class Keybinds {
     private:
-        std::map<Action, std::vector<sfKey>> keybinds;
+        std::map<Action, std::set<sfKey>> keybinds;
         int layoutNumber;
     
     public:
@@ -28,7 +28,7 @@ class Keybinds {
 
         void clearKeys(Action action);
 
-        const std::vector<Action>& getActions(sfKey key) const;
+        const std::set<Action> getActions(sfKey key) const;
 
-        const std::vector<sfKey>& getKeybinds(Action action) const;
+        const std::set<sfKey>& getKeybinds(Action action) const;
 };
diff --git a/src/GraphicalUI/Settings.h b/src/GraphicalUI/Settings.h
index e088197..4531aa9 100644
--- a/src/GraphicalUI/Settings.h
+++ b/src/GraphicalUI/Settings.h
@@ -10,6 +10,8 @@
 static const int MAXIMUM_BOARD_WIDTH = 40;
 static const int MAXIMUM_BOARD_HEIGHT = 40;
 
+static const int MAXIMUM_PIECES_SIZE = 10;
+
 
 class Settings {
     private:
diff --git a/src/GraphicalUI/main.cpp b/src/GraphicalUI/main.cpp
index 983ff93..f238f6f 100644
--- a/src/GraphicalUI/main.cpp
+++ b/src/GraphicalUI/main.cpp
@@ -137,17 +137,17 @@ void resetKeybindFile(int layout) {
         keybinds.insert({HOLD, sfKey::Z});
     }
 
-    char contentChar;
+    char byte;
     for (Action action : ACTION_LIST_IN_ORDER) {
-        contentChar = action;
-        layoutFile.write(&contentChar, 1);
+        byte = action;
+        layoutFile.write(&byte, 1);
 
         if (keybinds.contains(action)) {
-            contentChar = (int) keybinds.at(action);
-            layoutFile.write(&contentChar, 1);
+            byte = (int) keybinds.at(action);
+            layoutFile.write(&byte, 1);
         }
         
-        contentChar = 0xFF;
-        layoutFile.write(&contentChar, 1);
+        byte = 0xFF;
+        layoutFile.write(&byte, 1);
     }
 }