A good intro to the game mechanics is on Wikipedia here. The gist of the game is you start with blank halves of index cards and some from the previous game written on and anyone can fill in the blank cards as they draw them during the game. You then play the cards on each other and follow the instructions on the cards. There are many small variations on the rules so here is our specific rules:
- Hands are 5 cards by default and players draw back up to the 5 at the end of their turn.
- Points usually range +/- 100-1000 but is not a hard limit.
- Players may play counter cards or cards with instant effects any time they want, but must wait until the end of their next turn to redraw to 5.
This is a great game to play with close friends. It's extremely cheap to pick up a $3 pack of 500 index cards, cut them in half, and then go to a coffee shop and play. We scan many of our better cards and upload them to flickr here. I can't recommend this game enough for groups of creative friends dynamic enough to be able to go out and make fools of yourselves.