Survival: Night (Endless)

Survival: Night (Endless) is a hidden level that is in the Limbo Page. This can be accessed either using a Cheat Engine to unlock the Limbo Page, changing the game mode of Survival: Night or Survival: Night (Hard) using a Cheat Engine, or renaming saved files in user data. It can also be played in the the online version, replacing the Gargantuar and Giga-gargantuar with the Giga-Football Zombie and having all zombies up to the Screen Door Zombie. It is the Night version of Survival: Endless.

Limbo Page
There was a page of Mini-games, which were cancelled before the release of the game called the Limbo Page. The creator did not publish a visible link to this page.

Gain access to Limbo Page
Add three addresses and change each value to 144.

See this video tutorial.

Renaming saved files
This can be played by renaming saved files in the userdata folder. There is no need to use Cheat Engine.

For Steam users,the path instead is: C:ProgramFiles(x86)/Steam/userdata/"Steam user number here"/3590
 * 1) Pick your plants in Survival: Night (Hard) then leave the game.
 * 2) Go to the userdata folder C:\ProgramData\PopCap Games\PlantsVsZombies\userdata and rename game#_7 to game#_13 (# is the user number so look for game1_7 if user 1)
 * 3) Go to Survival: Endless and play it.

It is recommended to replace both the original and the backup, as it may not work upon simply replacing the original file.

Web version
In the online version of Plant vs. Zombies, there is a Survival: Night (Endless) level. It is known as Survival Mode or Survival: Online (Endless).

Zombies
Besides having limited plants and the player only can choose four plants each time, the gameplay is very similar.
 * Zombie
 * Flag Zombie
 * Conehead Zombie
 * Pole Vaulting Zombie
 * Buckethead Zombie
 * Newspaper Zombie
 * Screen Door Zombie
 * Giga-Football Zombie

Trivia

 * This might be the most difficult Survival: Endless game because it takes place at night, so no sun falls from the sky. In addition, there is no pool, which is a safe place for Cob Cannons, Gloom-shrooms, and Cattails.
 * Also, there are graves which can "swallow" your plants.