Cheat codes:
Better game versions:
Click the small button on the left side of a game and you will be able to play the later, updated version of it.

Centipede: Scorpions:
In levels 4 and higher, scorpions start appearing. Eliminate them quickly or they will poison the mushrooms. When the centipede touches them, it will start to dive down to the ground -- get out of the way.