diff --git a/app/main.c b/app/main.c
index 1b3c65c..0e3d096 100644
--- a/app/main.c
+++ b/app/main.c
@@ -481,6 +481,8 @@ int main(int argc, char *argv[])
 		.src = { .w = PWIDTH, .h = PHEIGHT },
 	};
 
+	bool f = true;
+	SDL_SetRenderDrawColor(renderer, 0xff, 0x00, 0x00, 0xff);
 	SDL_Event event;
 	uint64_t prevt = SDL_GetTicks64();
 	while (1) {
@@ -569,10 +571,16 @@ int main(int argc, char *argv[])
 			}
 		}
 
+		f = !f;
+
 		SDL_RenderClear(renderer);
 		mapdraw();
 		objsdraw(t);
 		entitydraw(&p, t);
+		if (f) {
+			const SDL_Rect i = { .x = 10, .y = 10, .w = 20, .h = 20 };
+			SDL_RenderFillRect(renderer, &i);
+		}
 		SDL_RenderPresent(renderer);
 	}