Press ~ after starting the game at the screen where
the items are described. Proceed for two more screens
and press [backspace] at the screen with the magic lamp.
This enables the cheat mode. Then, press one of the
following keys during gameplay to activate the cheat.
Level Select - 1A through 1M
Level Skip - [keypad +]
Five Apples - A
Five Gems - G
Toggle Invincibility - H
Toggle Free Movement - M
Toggle Objects in some levels - U