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.

Effect - 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]