ideas for the limiting things in wads trend

[Foofoo]

-One Movement Wad; you can only move in one direction once only in the wad.
-12 pixels in Length Wad; each wall can only be up to 12 pixels long.
-One Startpoint Wad; the wad can only have one start point and not have any others erroniously added in.

[Epyo]

I'm gonna try that 3rd one.

[Tormentor667]

- 10 Linedefs map, not double sided
- 1 room wad
- 1 vertex wad
- 1 door wad
- 1 ijurhefkljewghr wad!

[wildweasel]

One-weapon deathmatch. Give each player nothing but a shotgun and infinite ammo.

[Vegeta]

A linear map with a scrolling flor so strong that you can't turn back, but you can stop in the place by running backward.

[CODOR]

10 lumps only. You can do whatever you want, as long as the wad file has no more than 10 entries in its directory.

[esselfortium]

100kb total wad size.

[Dutch Doomer]

666 things, 666 sectors, 666 linedefs, 666 sidedefs, textures/flats with 666 on them.
666kb in size, 666 doors, 666 teleporters, all monsters say 666 when they die.

[Grazza]

No movement wad: I still like my idea of making maps where the player can only exit as long as he does absolutely nothing at all. No restrictions beyond that.