- Not to be confused with Mysterious Factory!
The Curious Factory is the first level of the Ruby Passage from the Game Boy Advance game Wario Land 4. It is a labyrinth of a factory with robot-like enemies and many machines called Compressors and Decompressors, which turn Wario into Flat Wario and back again. Most of the flooring and platforms in the level are made up of conveyor belts. The enemy Kaentsubo first appears in this level. The Kaentsubo's heads are on fire, and when they get close to Wario, he will transform into Flaming Wario and will be able to break Bonfire Blocks. Hitting the switch will open up the underground area of the level, which is more challenging than the upper level. This level's CD is called Driftwood & the Island Dog and once collected, it can be played in the Sound Room.
Time given in different modes
The time given to escape the level after hitting the switch varies between game modes.
- File:WL4-Normal Mode Sprite.PNG: the time given is 3:30.
- File:WL4-Hard Mode Sprite.PNG: the time given is 2:50.
- File:WL4-S-Hard Mode Sprite.PNG (unlockable): the time given is 2:30.
Names in other languages
| Language | Name | Meaning | Notes |
|---|---|---|---|
| Japanese | あやしいこうじょう[?] Ayashii Kōjō |
The Mysterious Factory | |
| Chinese | 奇怪的工厂[?] Qíguài de Gōngchǎng |
The Odd Factory |
Media
Gallery
- WL4-Togerobo.PNG
- Wl4 flatwario.PNG
Wario getting crushed by a Compressor, transforming him into Flat Wario - WL4-Robo Bird.PNG
Wario with a Robo Bird 
Flat Wario artwork 
Flat Wario sprite - WL4-Decompressor.PNG
Wario about to enter a Decompressor, which will turn him back into normal Wario - WL4 Beta-The Curious Factory.PNG
Pre-release screenshot of The Curious Factory - Sound Room-Driftwood and the Island Dog.PNG
Driftwood & the Island Dog album cover
Trivia
- This level's music can be found in the WarioWare, Inc.: Mega Microgame$! microgame Paper Plane without the machinery sounds.