Invisi-ghoul

Invisighoul is the sixth mini game,a conveyor belt unlocked by completing Adventure and three other minigames.

It takes place in Fog, but there is no fog. Instead, all of the zombies are invisible.

Zombies
Zombie

Conehead Zombie

Buckethead Zombie

Jack-in-the-Box Zombie

Dolphin Rider Zombie

Zomboni

Zombie Bobsled Team

Strategy
The Plants provided are the Peashooter, Lily Pad, Kernel-pult, Ice-shroom, and Wall-nut.

The Rake is highly suggested on this level, as it provides you with time to set up your defenses so the you can have weapons in every lane to protect from possible zombies.

Ice-shrooms are also very helpful, as they reveal the wherebouts of all the frozen land zombies.

Listen for clues as to what zombies are in the screen--Coneheads make a dull thudding sound when hit, and Bucketheads and Zombonies a metallic clang.

Zombonies leave a visible ice trail behind them, Jack-in-the-Boxes make music, and Dolphins make...Dolphin noises.