The game is basically a replica of a classic arcade touch screen game. You have to spot 5 differences in the two pictures before time runs out. You are given three free difference spotters (and more for every 100,000 points you score). You earn points for the remaining time left after every round. You lose time if you click randomly on the screen. Its fun. See where you rank in the world at the end by posting your score on the online scoreboard. Peace.