Make it to the final boss, Mr. Big, and beat him without having lost a single round in any of your matches and after him, you will fight Geese, an extra boss.

You must have Art of Fighting 1 for this to work.

To gain extra power, first complete the 3 bonus game in Art of Fighting 1, then save, and load the game on Art of Fighting 2. You'll have extra power.

When you see ''Saurus'' press:
(diagonal) down left, right, (diagonal) down right, down, (diagonal) down left, left, (diagonal) down right, then hold R and Y.

In the one player mode, beat every opponent without losing a round in any match. Instead of the game ending after you beat Mr. Big, you'll be taken to a special stage set in Geese's tower where you will fight him.

To fight Geese Howard, defeat every opponent in the one player mode without losing a round at any time. After Mr. Big, you will fight Geese.

In the one player mode, fight and defeat every opponent without losing a round in any match. Instead of the game ending after you beat the normal boss Mr. Big, you will be taken to a special stage set in Geese Howard's tower where you will fight him.