Arena is a stage in Tekken 4. This fight is a cage match, as it takes place in a ring surrounded by metal bars. Spectators cheer the fighters on from outside of the ring. Also, outside of the ring, a screen will display the characters fighting.
The stage BGM is titled "The Strongest Iron Arena".
- Heihachi Mishima is usually fought here.
- In the Japanese version, there is a way to get rid of the bars around the arena. The player must first finish time attack mode and must then play story mode with the same character while skipping Heihachi's introduction. When the round begins, the bars will be invisible. The player can leave the arena using the ramp that Heihachi came down from. 
- This stage was reimagined in TTT2 as well as its background music being remixed.