Unlock everything:
In the 3D game section, press START to enter the pause menu, then enter the following button-tap cheat: UP, UP, DOWN, DOWN, LEFT, RIGHT, LEFT, RIGHT, B, A, START. This will unlock all combos and upgrades, plus max money, health and power rejuvenation.
Unlock Evil Ulrich:
To unlock Evil Ulrich, enter the following button-tap cheat at the profile selection screen while holding L R: UP, LEFT, RIGHT, Y, X.