Level 5-11 was a bonus level, and the eleventh Roof level in Plants vs. Zombies: Journey to the West. The player had to pay 20 gems to gain access to this level. To complete the level, the player had to not spend any sun in 45 seconds.
Ladder Zombie and other zombies behind it could easily pass through the player's defensive plants unless they removed the ladder that it places.
Bungee Zombies would take away some of the player's plants, and bring more zombies in the final wave.
The objective, however, would not have been a big problem with Hero Plants.