Hi LebbyFoxx! In a normal PICO-8 game, I'd use a function for rectangular collisions, but for Tweetcarts, I use pget(x,y). Pget grabs the color of pixel at x,y and returns it. So if you're colliding with a red object, check if pget(x,y) == 8. If so, end the game. If not, continue! :)