diff --git a/src/core.h b/src/core.h
index f6f5047..3c537d7 100644
--- a/src/core.h
+++ b/src/core.h
@@ -1,6 +1,8 @@
 #ifndef _PLAGUE_CORE_H
 #define _PLAGUE_CORE_H
 
+#include <gint/defs/types.h>
+
 // Duration for internal clock (ms)
 #define ENGINE_TICK 50
 #define CURSOR_TICK 150
@@ -12,6 +14,12 @@
 // Number of planes on screen
 #define NB_PLANES 5
 
+struct grid {
+    int width;
+    int height;
+    uint8_t *data;
+};
+
 // game : all statistics of the current game
 struct game
 {
@@ -36,7 +44,7 @@ struct game
     struct plane *planes[NB_PLANES + 1];
 
     // Grid for epidemologic model
-    int grid[16][32];
+    struct grid grid;
 };
 
 // plane : information about planes
@@ -81,4 +89,4 @@ int callback_tick(volatile int *tick);
 // message : display a message
 void message(const char *msg[5]);
 
-#endif /* _PLAGUE_CORE_H */
\ No newline at end of file
+#endif /* _PLAGUE_CORE_H */
diff --git a/src/main.c b/src/main.c
index dd6ab59..3ca085a 100644
--- a/src/main.c
+++ b/src/main.c
@@ -11,6 +11,8 @@
 #include <gint/keyboard.h>
 #include <gint/timer.h>
 #include <gint/clock.h>
+#include <gint/defs/types.h>
+#include <gint/std/stdlib.h>
 
 #include "core.h"
 #include "display_engine.h"
@@ -59,11 +61,18 @@ int main(void)
 
         .planes = {&plane_1, &plane_2, &plane_3, &plane_4, &plane_5, NULL},
 
-        .grid = {{0}},
+        .grid = { 128, 64, NULL },
     };
 
+    /* allocate memory */
+    current_game.grid.data = calloc(current_game.grid.width *
+                                    current_game.grid.height, sizeof(uint8_t));
+
     main_loop(&current_game);
 
+    /* free memory */
+    free(current_game.grid.data);
+
     return 1;
 }