Gubble 2 cheats and cheat codes for PC

Cheat mode:
When you are at the starting menu, type "gubble2cheats". If the code is 
accepted, you will hear a sound. Now you can press the following keys 
on the indicated screen to enable the indicated cheat effect.
Note: Enabling any of the cheat codes will remove scoring 
for the current level. 

Press the following key on the map:
F3 - Delete all blocks and barriers

Press the following keys standing beside coin with level name:
Key - Effect:
Page Up - Level skip
Page Down - Previous level
Home - Advance ten levels
End - Return ten levels

Press the following keys during the game play:
Key - Effect:
F8 - Toggle invincibility
F9 - Complete current level
Plus - Faster game
Minus - Slower game