Cheat is a standard deck playing card game; it is a simple game of bluffing and deduction for 3-10 players.
A regular deck of 52 playing cards is dealt in its entirety to all players. Players take it in turn to play 1-4 cards onto the stack of cards. When a player plays, they must declare the number of cards played and give the value of a card (ace - king): for example "three queens". The value given must be either one above, one below or the same as the value given by the previous player. Any player may call "cheat" before the next player plays. When a player calls "cheat", the number of cards declared is then revealed. If the cards are all of the value given, the player who called "cheat" must take the whole stack of cards into their hand and the falsely accused cheater may start a new stack. However, if the cards are not all of the value declared, the cheater takes the stack into his hand and the first accuser starts a new stack. A player wins by emptying their hand. The game ends when there are only three players remaining.
This game is also known as Bullshit. In Hoyle's Rules of Games it is referred to as I Doubt It.