Totally Nuts is the fourth level of I, Zombie in Plants vs. Zombies, Plants vs. Zombies: Journey to the West, and Plants vs. Zombies: Great Wall Edition. The level mainly focuses on Ladder Zombies and Wall-nuts, with it being the first level to include Ladder Zombies and Wall-nuts always being on the rightmost column.
Use Ladder Zombies to climb over Wall-nuts. They are immune to Snow Pea's freezing effect when holding their ladders. A single Ladder Zombie can also survive in a lane with two Peashooters or one Snow Pea (if he is placed directly next to Wall-nuts), even without his ladder. A Ladder Zombie and a Zombie will also survive if there are only two Peashooters on the baseline or one Snow Pea on the second column. Since Ladder Zombie's shield does not protect him from Fume-shrooms, use Buckethead Zombies in their lanes instead. If there is only a single Peashooter and no other offensive plants in that row, a Buckethead Zombie can survive, regardless of where the Peashooter is. If the peas are away from the Wall-nuts that a Ladder Zombie and a Zombie won't survive, use two Buckethead Zombies. They can crush every combination of peas.
If you want to save sun, in the lane with Fume-shrooms, first send a Buckethead Zombie to finish the Wall-nut. After it is eaten, place another Buckethead Zombie. By then, the first zombie's bucket should have fallen off. If you send them both as once, the Fume-shroom's fumes will damage both zombies.
- Fume-shrooms always appear on the left two columns in the third row.
- The level's name might be referring to the expression that symbolizes something crazy or absurd, and the fact that the fourth column is lined with Wall-nuts.