The game begins with all cards face down. Each card has an image on the face-side. Each image is on only two cards, and the cards are scrambled randomly. The object is to find matches for each image in the shortest amount of time possible.
Each time you successfully find a match, your score increases. How much it increases by is based on the time from when you click 'START', the time since the last match, and which match it is. You get points for doing things fast and early, so you get more points the closer to the start of the game, the closer two matches are together, and the first match is worth more than the last. This means that the beginning of the game is important, however you can still get a good score even if you don't have a stellar start.