diff --git a/Core/Inc/game.h b/Core/Inc/game.h
new file mode 100644
index 0000000..40662bb
--- /dev/null
+++ b/Core/Inc/game.h
@@ -0,0 +1,28 @@
+#define MAX_PLAYERS 6
+#define TIMER_MAX 180
+#define TIMER_STEP 5
+
+#include <stdint.h>
+#include <stdbool.h>
+
+typedef struct {
+	bool countScores;
+	uint8_t activePlayers;
+	uint8_t currentPlayer;
+	uint32_t turnTime;
+	uint32_t timerValue;
+	uint32_t scores[MAX_PLAYERS];
+} GameEngine;
+
+extern GameEngine game;
+
+void InitGameEngine();
+void IncrementTurnTime();
+void DecrementTurnTime();
+void AddPlayer();
+void RemovePlayer();
+uint32_t GetCurrentPlayer();
+uint32_t GetTimerValue();
+void ChangeScore(int8_t delta);
+void ResetTurnTimer();
+void NextPlayer();
\ No newline at end of file
diff --git a/Core/Src/game.c b/Core/Src/game.c
new file mode 100644
index 0000000..0f7b42a
--- /dev/null
+++ b/Core/Src/game.c
@@ -0,0 +1,61 @@
+#include "game.h"
+
+void InitGameEngine() {
+    game.timerValue = game.turnTime;
+	game.countScores = false;
+	game.activePlayers = 0;
+	game.currentPlayer = 0;
+	game.turnTime = TIMER_MAX / 2;
+	game.timerValue = game.turnTime;
+    for (int i=0; i<MAX_PLAYERS; i++)
+        game.scores[i] = -1;
+}
+
+void DecrementTurnTime() {
+    if (game.turnTime > TIMER_STEP)
+        game.turnTime -= TIMER_STEP;
+    else 
+        game.turnTime = TIMER_MAX;
+    game.timerValue = game.turnTime;
+}
+
+void IncrementTurnTime() {
+    if (game.turnTime + TIMER_STEP <= TIMER_MAX)
+        game.turnTime += TIMER_STEP;
+    else
+        game.turnTime = TIMER_STEP;
+    game.timerValue = game.turnTime;
+}
+
+void AddPlayer() {
+    if (game.activePlayers < MAX_PLAYERS) {
+        game.scores[game.activePlayers++] = 0;
+    }
+}	
+
+void RemovePlayer() {
+    if (game.activePlayers > 0) {
+        game.scores[game.activePlayers--] = -1;
+    }
+}
+
+uint32_t GetCurrentPlayer() {
+    return game.currentPlayer;
+}
+
+uint32_t GetTimerValue() {
+    return game.timerValue;
+}
+
+void ChangeScore(int8_t delta) {
+    game.scores[game.currentPlayer] += delta;
+}
+
+void ResetTurnTimer() {
+    game.timerValue = game.turnTime;
+}
+
+void NextPlayer() {
+    game.currentPlayer = (game.currentPlayer + 1) % game.activePlayers;
+    ResetTurnTimer();
+}
diff --git a/Core/Src/main.c b/Core/Src/main.c
index 8979b20..5d50b37 100644
--- a/Core/Src/main.c
+++ b/Core/Src/main.c
@@ -25,6 +25,7 @@
 /* Private includes ----------------------------------------------------------*/
 /* USER CODE BEGIN Includes */
 #include "lcd.h"
+#include "game.h"
 #include <stdlib.h>
 
 /* USER CODE END Includes */
@@ -36,6 +37,9 @@
 
 /* Private define ------------------------------------------------------------*/
 /* USER CODE BEGIN PD */
+#define LCD_ADDR (0x27 << 1)
+#define LCD_COLS 20
+#define LCD_ROWS 4
 
 /* USER CODE END PD */
 
@@ -55,11 +59,13 @@ UART_HandleTypeDef huart1;
 DMA_HandleTypeDef hdma_usart1_tx;
 
 /* USER CODE BEGIN PV */
+
+GameEngine game;
 LCD_HandleTypeDef hlcd = { 
     &hi2c1,
-    (0x27 << 1),
-    4,
-    20
+    LCD_ADDR,
+    LCD_ROWS,
+    LCD_COLS
 };
 
 /* USER CODE END PV */
@@ -118,13 +124,13 @@ int main(void)
   MX_USB_DEVICE_Init();
   /* USER CODE BEGIN 2 */
   LCD_Init(&hlcd);
+  InitGameEngine();
   /* USER CODE END 2 */
 
   /* Infinite loop */
   /* USER CODE BEGIN WHILE */
   while (1)
   {
-
     /* USER CODE END WHILE */
 
     /* USER CODE BEGIN 3 */
diff --git a/Makefile b/Makefile
index 1e1996a..1cc147d 100644
--- a/Makefile
+++ b/Makefile
@@ -38,6 +38,7 @@ BUILD_DIR = build
 C_SOURCES =  \
 Core/Src/main.c \
 Core/Src/lcd.c \
+Core/Src/game.c \
 Core/Src/stm32f1xx_it.c \
 Core/Src/stm32f1xx_hal_msp.c \
 USB_DEVICE/App/usb_device.c \