Pause game play and hold CTRL, then activate the following cheats by entering the corresponding codes:

CHEAT FUNCTION - CHEAT CODE
Unlimited lives - DOWN, DOWN, UP, DOWN, RIGHT, DOWN, UP, UP
Level select - UP, DOWN, LEFT, RIGHT, RIGHT, RIGHT, DOWN, LEFT
All characters unlocked - LEFT, RIGHT, LEFT, LEFT, LEFT, UP, LEFT, LEFT
Level skip - RIGHT, LEFT, UP, UP, UP, RIGHT, LEFT, LEFT
Extras and bonus levels unlocked - RIGHT, UP, UP, DOWN, RIGHT, DOWN, RIGHT
Temporary invincibility - LEFT, LEFT, UP, LEFT, DOWN, RIGHT, RIGHT, RIGHT
Turn coins into Mad Garibs - RIGHT, LEFT, RIGHT, LEFT, UP, UP, LEFT, RIGHT

Collect every gold coin on a level to unlock a secret for that level.

Kill snakes by stepping on their backs. However, do not hit their heads.

At the part where the ants are going in a straight line, go in the part where the ants go in. Be careful inside, as there are small ants. You should find six lives. Note: Having the Feeding Frenzy power-up activated is recommended.