San is a game of observation and speed: to win need quick reflexes and a good and rapid observation of details. The game is very simple: at every turn are displayed on the screen 3 cards, each of which has three characteristics:
1) the figure drawn to its center
2) the color of the figure
3) the color of the background paper

The player must observe the 3 cards and press one of two buttons on its side of the screen before the opposing player: if you press the correct button gets a point, otherwise he loses a point.