3D floors or extra floors are an editing feature supported by some Doom source ports which allows the designer to make free-standing or room-over-room platforms.
This feature was initially pioneered by DOSDoom and carried over into EDGE.
An alternative way to doing 3D architecture in Doom is by using portals.
Ports with 3D floors
- Doom Legacy
- Skulltag (Only visible in non-competitive modes in OpenGL rendering mode)
- Sonic Robo Blast 2