Survival: Night Roof (Endless) is a hidden level. It can be accessed in different ways like using Cheat Engine to unlock and rename the saved file in the user data folder. It is the Night Roof variation of Survival: Endless
How to access
- Play Dr. Zomboss's Revenge until you have enough plants and Dr. Zomboss is about to attack. The conveyor belt should be full and you should have 10 seed slots, or the game will crash after renaming.
- Go to userdata and rename game#_35 to game#_30. (# is the user number e.g. game1_35 if user 1)
- Go to Whack a Zombie and hit Dr. Zomboss when he is about to attack. Earn 350-500 sun by hitting zombies.
- Rename game#_30 to game#_10.
- Go to Survival: Roof (Hard) and play it until flag 8.
- Rename game#_10 to game#_13 and continue it in Survival: Endless.
There is a second way discovered recently (January 2018) that will let you have more sun, and more choice early on for your setup, though it requires Cheat Engine. It is shown in the following video: https://www.youtube.com/watch?v=6dll64GQcRI&t=23s
- ^: Strategy page