The player will get some decent attacking plants, as well as Horsebean, which will be the heavy-hitter plant the player will use. To ensure that the Horsebean are not damaged, placing them on the ground lanes is a good idea, rather than the sky. This is because Zombie Fighters are present, and they can defeat Horsebean if the player isn't careful. Rotobaga can act as meat shields for other zombies, and Threepeater can deal some additional damage. Saucer Squash can stall some bigger threats like Buckethead Pilot Zombie and Zombie Fighter.
In hard mode, the player has to defeat leveled-up zombies.
Difficulty
While the zombies are no longer at level 1, it's still beatable with level 1 plants. Horsebean can still do a fair amount of damage to zombies. At this point, level 1 Rotobagas are basically meatshields to protect the ship from Zombie Fighter's bullets.
Strategies
In hard mode, the zombies will likely be level 3. This means the player should level up their plants, preferably Horsebean. Zombie Fighters can be hard to defeat at level 3, so as said before, leveling up the given plants is crucial.
The small number next to the zombie icon means that zombie will always appear in that lane, with 1 being the topmost lane and 5 being the bottommost lane.
