This is a clone of the game Snap. But, with a twist.

Here's some text from the readme:
The aim of the game is to get 5 snaps before the timer reaches 30 seconds (will show as 30000)! To get snap, you must see two cards the same and then press O, if you have got a snap you score will go up by 1. If you get 5 snaps before 30 seconds you win. If the timer gets to 30 seconds before you get 5 snaps you will loose. This may sound easy, but the cards are placed at random! If you have any suggestions, advice or death threats (wait..scratch that!), head over to his forum thread here.