diff --git a/client/src/render/render.c b/client/src/render/render.c
index 7fc2181..8212f74 100644
--- a/client/src/render/render.c
+++ b/client/src/render/render.c
@@ -6,6 +6,8 @@
 
 
 void render_world(struct world_t const *world) {
+    printf("%zu %zu\n", world->height, world->width);
+
     for (size_t i = 0; i < MAX_ENTITIES; i++) {
         struct entity_t const *const entity = &world->entities[i];
         struct entity_registrant_t const *const registrant =
diff --git a/server/src/main.c b/server/src/main.c
index db985ba..94894e2 100644
--- a/server/src/main.c
+++ b/server/src/main.c
@@ -28,9 +28,19 @@ static enum error_t simulation_thread_body(struct game_data_t *data) {
     assert(data != NULL);
 
     // TODO: An actual game loop lol
-    printf("Hello, world!\n");
+    while (true) {
+        if (pthread_mutex_lock(&data->world_lock) != 0) goto error;
+        data->world.width  = (data->world.width  + 1) % 100;
+        data->world.height = (data->world.height + 1) % 100;
+        if (pthread_mutex_unlock(&data->world_lock) != 0) goto error;
+
+        sleep(1);
+    }
 
     return ERR_OK;
+
+error:
+    return ERR_MUTEX;
 }