Coral Corral

Usage
The Coral Corral lets zombies in, but doesn't let them go. It can withstand extremely high amounts of damage, but its sole weakness is a Yeti Zombie.

Pros

 * Zombies get trapped.
 * It's ridiculously strong.
 * It can withstand multiple Zombonis.

Cons

 * The Yeti Zombie can escape.
 * It's ridiculously costly.
 * It can get smashed to just a little wall of coral.