Unsodded

Unsodded is a cancelled mini-game which can still be played by using Cheat Engine.

In this mini-game, there are only three lanes that can be planted on (like in Level 1-2 and 1-3). Zombies will come out in the lanes that cannot be planted. Despite the seemingly difficult appearance of this level, it's actually quite easy because the player is given plenty of time to build their defenses before zombies start coming into the top and bottom rows.

If you change the name of a save file from this game to the name of Survival: Endless save files (usually game_13), you will get a Survival: Endless variation which is slightly different from this mini-game: The first and last lanes now appear normal, but you still cannot plant on there, nor will any zombies come from there (they will in the mini-game).

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

Gain Access to Limbo Page
Add three addresses and change all the value to 144.

See the video tutorial.

Zombies

 * Zombie
 * Flag Zombie
 * Conehead Zombie
 * Buckethead Zombie

Strategy
Zombies will appear on the lanes where you can't plant; therefore, good use of Threepeaters and explosive plants (such as the Cherry Bomb) is recommended. The Starfruit would also come in handy. Gloom-shrooms are also a good choice (they require Fume-shrooms).

Trivia

 * Unsodded, Sunny Day and Big Time are the only hidden mini-games that have four flags.
 * The icon of the mini-game is the Slot Machine icon.