Slam It! is a fast-paced, reaction-based card game which gets harder and more confusing to play as more rules are added. The aim of the game is to get rid of all your cards.
Players take it in turns to play numbered cards onto a central pile while stating the count which starts at "0" and increases around the circle (1,2 3, etc.). If at any point the card on top of the pile matches the count then all players SLAM the pile and the last person to do so must pick up the cards.
Special cards affect gameplay by skipping turns or reversing the direction of play. When a round ends in which a special "Bomb" card was played, a new rule is added to the game from a separate deck of rule cards.
The new rules change how the game is played and quickly increase the number of things players have to be paying attention to! The game ends when the "GAME OVER" card is drawn from the rule deck, at which point the person with the most cards loses!
—description from the publisher