Type gubble2cheats at the starting menu. A sound
will confirm correct code entry. Press one of the following keys
at the indicated screen to activate the corresponding cheat function.
Note: Enabling cheats will remove scoring for the current level.

Screen Key
Delete all blocks and barriers Map
[F3]
Level skip Standing beside coin with level name
[Page Up]
Previous level Standing beside coin with level name
[Page Down]
Advance ten levels Standing beside coin with level name
[Home]
Return ten levels Standing beside coin with level name
[End]
Toggle invincibility Game play
[F8]
Complete current level Game play
[F9]
Faster game Game play
[Plus]
Slower game Game play
[Minus]