Hi-Spy is a card game, where a player must get rid of his cards first to become the winner.

There are 112 cards:
- 78 number cards (numbers 1-6, 13 from each)
- 7 UN cards
- 7 War cards
- 10 Peace cards
- 10 Spy cards

Players play cards face down under certain rules. The following player has the option to believe that these rules were observed, or he can ask for a check. Depending on what card is revealed, one of the two involved players is punished and the other is rewarded.