In I Go!, players draw and discard iteratively, attempting to improve the quality of their hands. You can improve your hand by forming a run (using 1 or 2 colors), matching the top card of the 'display' stack, or simply keeping low values cards. After your turn, you can declare "I Go!" to claim that you have the best hand (fewest penalty points). Other players can then play off of your run, and the best hand scores a point. First to 4 points wins.
The deck contains 10 suits, each numbered 1-11, for a total of 110 cards. The game is abstract and has no theme.
From the box:
I Go! is a fast-paced game that gets the whole family thinking on their feet. Draw cards in turns and try to improve your hand. Think yours in the best? Declare "I Go!" Were you too hasty, or was it worth taking the risk? Be alert and astute and win at I Go!
Corsari is the original release of the game with a Pirate theme.