diff --git a/CMakeLists.txt b/CMakeLists.txt
index 14c5f0e..79062ee 100755
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -51,6 +51,7 @@ set(SOURCES
 	src/main.c
 	src/menu.c
 	src/save.c
+	src/util.c
 	generated/setlevel.c
 	generated/times.c)
 
diff --git a/include/menu.h b/include/menu.h
index cd6e13d..bbb987d 100755
--- a/include/menu.h
+++ b/include/menu.h
@@ -1,3 +1,6 @@
-char start_menu();
+#pragma once
+
+enum MenuCode { MenuLevelSel, MenuAllMode, MenuTutorial, MenuExit };
+
+enum MenuCode start_menu();
 char speed_menu(int *id_level);
-int round(float num);
diff --git a/include/util.h b/include/util.h
new file mode 100644
index 0000000..4b0ba63
--- /dev/null
+++ b/include/util.h
@@ -0,0 +1,3 @@
+#pragma once
+
+int round(float num);
diff --git a/src/main.c b/src/main.c
index a8f66ab..9519e0c 100644
--- a/src/main.c
+++ b/src/main.c
@@ -4,10 +4,10 @@
 #include <gint/keyboard.h>
 #include <gint/std/string.h>
 #include <gint/timer.h>
-
 #include "collide.h"
 #include "define.h"
 #include "drawlevel.h"
+#include "util.h"
 #include "menu.h"
 #include "save.h"
 #include "setlevel.h"
@@ -18,18 +18,62 @@
 #define MAX_VSPD 9.0
 #define FRICTION 0.2
 
-int main(void);
-void end(unsigned int frame);
+static int callback(volatile int *frame_elapsed);
+static void end(unsigned int frame);
+static void game(int *id_level, char mode, char *type);
 
-char run = 0;
+int main(void)
+{
+	static int run = 0;
+	if (!run) {
+		gint_world_switch(GINT_CALL(restore));
+		run = 1;
+	}
 
-int callback(volatile int *frame_elapsed)
+	char mode = 0;
+	char type = 1;
+	const enum MenuCode valeur = start_menu(&type);
+
+	switch (valeur) {
+	case MenuLevelSel: {
+		int id_level = 1;
+		if (!speed_menu(&id_level)) {
+			mode = 1;
+			game(&id_level, mode, &type);
+		} else
+			main();
+	} break;
+	case MenuAllMode: {
+		int id_level = 1;
+		mode = 0;
+		game(&id_level, mode, &type);
+	} break;
+	case MenuTutorial: {
+		int id_level = 0;
+		mode = 1;
+		game(&id_level, mode, &type);
+	} break;
+	case MenuExit:
+		gint_world_switch(GINT_CALL(savefile));
+		break;
+	}
+	return 0;
+}
+
+static int callback(volatile int *frame_elapsed)
 {
 	*frame_elapsed = 1;
 	return TIMER_CONTINUE;
 }
 
-void game(int *id_level, char mode, char *type)
+static void end(unsigned int frame)
+{
+	draw_end((int)frame, 15, 2);
+	sleep_ms(7000);
+	main();
+}
+
+static void game(int *id_level, char mode, char *type)
 {
 	volatile int frame_elapsed = 1;
 	int timer = timer_configure(TIMER_ANY, 1000000 / FPS,
@@ -147,8 +191,7 @@ void game(int *id_level, char mode, char *type)
 		} else
 			hspd = 0;
 		// Action key
-		if (keydown(KEY_SHIFT) && !check &&
-		    nbswitch > 0 &&
+		if (keydown(KEY_SHIFT) && !check && nbswitch > 0 &&
 		    ((collide_solid(player_x, player_y - 1, level) &&
 		      gravity) ||
 		     (collide_solid(player_x, player_y + 1, level) &&
@@ -505,42 +548,3 @@ void game(int *id_level, char mode, char *type)
 	} else
 		main();
 }
-
-void end(unsigned int frame)
-{
-	draw_end((int)frame, 15, 2);
-	sleep_ms(7000);
-	main();
-}
-
-int main(void)
-{
-	if (!run) {
-		gint_world_switch(GINT_CALL(restore));
-		run = 1;
-	}
-	char mode = 0;
-	char type = 1;
-	char valeur = start_menu(&type);
-	if (!valeur) // normal game (level selection)
-	{
-		int id_level = 1;
-		if (!speed_menu(&id_level)) {
-			mode = 1;
-			game(&id_level, mode, &type);
-		} else
-			main();
-	} else if (valeur == 1) // all mode
-	{
-		int id_level = 1;
-		mode = 0;
-		game(&id_level, mode, &type);
-	} else if (valeur == 2) // tutorial
-	{
-		int id_level = 0;
-		mode = 1;
-		game(&id_level, mode, &type);
-	} else if (valeur == 3) // exit
-		gint_world_switch(GINT_CALL(savefile));
-	return 0;
-}
diff --git a/src/menu.c b/src/menu.c
index 6f7e0a6..cf9e2dc 100644
--- a/src/menu.c
+++ b/src/menu.c
@@ -1,4 +1,6 @@
+#include "menu.h"
 #include "define.h"
+#include "util.h"
 #include "drawlevel.h"
 #include "save.h"
 #include "setlevel.h"
@@ -7,12 +9,7 @@
 #include <gint/gint.h>
 #include <gint/keyboard.h>
 
-int round(float num) // round(2.5) = 3 round(-3.2) = -3
-{
-	return num < 0 ? num - 0.5 : num + 0.5;
-}
-
-char start_menu(char *type)
+enum MenuCode start_menu(char *type)
 {
 	extern bopti_image_t img_menu;
 	char menu_loop = 1;
@@ -112,3 +109,4 @@ char speed_menu(int *id_level)
 	}
 	return 0;
 }
+
diff --git a/src/util.c b/src/util.c
new file mode 100644
index 0000000..f1430b0
--- /dev/null
+++ b/src/util.c
@@ -0,0 +1,6 @@
+#include "util.h"
+
+int round(float num)
+{
+	return (num < 0) ? (num - 0.5) : (num + 0.5);
+}