Few people know, but the developers there were mini-games that were canceled for technical reasons, or were not finalized.
Plants vs. Zombies: Table for Cheat Engine (Open canceled minigames) [UPD: 08/24/2020, Steam-version + Pirate] Free Download
Now they can be opened through the Cheat Engine, but this requires a specific table. You can do everything manually, but this table simplifies process.
How to start:
1. Launch Cheat Engine (if you don’t have it, download it)
2. Load the table.
3. Start the game.
4. Select the process (PlantsVsZombies.exe or popcapgame1.exe)
5. Change Value to 144 (everywhere)
6. Open mini-games, and below select Limbo.
7. Everything is ready!
Unfortunately, some may crash, solved by changing the table.
Download Cheat Engine from our server you can here.