User blog comment:MignightHawk/Grammar Quiz/@comment-26531060-20130507023514

Easy 2: Zombies are the enemies in Plants vs. Zombies.

Medium 2: The rare Zombie Yeti is not on the seed selection screen and drops diamonds when killed.

Hard 3: The player may use a Cherry Bomb to kill a huge wave of zombies, but it doesn't matter if the defenses are good enough.