Cheat Mode: At the start of the game, collect the items above the house in the following order: Cake, Hammer, Earth globe, Apple and Tap (spelling CHEAT). These items are after the third pit in the first stage. You will become invincible. Enter the first door and go to the left to quit the stage. After that, all doors will be unlocked.
Power Up: In the first stage, after passing the first spike pit, you will find some items. Take them in the following order: Penguin, Oil can, Wine glass, Earth globe and Racket (spelling POWER).
Infinite Lives: In the first stage, after passing the second spike pit, you will find some items. Take them in the following order: Lips, Ice cream, Violin, Earth globe and Snowman (spelling LIVES).