Version Differences: Subchamber Grooves
| North American Versions | European Version |
 Subchamber 3 |
 Subchamber 3 |
 Subchamber 4 |
 Subchamber 4 |
Notes:
- Perhaps in order to make the final boss more difficult, one groove was removed from the floor in Subchamber 3 in the Japanese and European versions of the game, while two were removed from Subchamber 4 in those versions.
- Subchamber 2's floor has three grooves regardless of version.