Infinity remakes of some classic M1 levels... these bring back memories. (I even remembered where the flamethrower was on KillKillKill!) In general, these are much brighter than the originals... this may disappoint you if you like to lurk in shadows (which all three of these maps were good for). Two versions of Billy... one with media and one without.

A mazelike level, with the hill in the center. Once you're on it, you'll be there until you die... and once you run out of ammo, you won't be able to defend yourself. Each section has a route to the hill. A little claustrophobic- the ceilings aren't very high (usually).

Large (frighteningly large), and it uses exactly one texture. Designed to look like a rabbit warren. It does. I say leave it to the rabbits.

A multi-tiered arena, with the hill at the bottom. Small rooms around the outside of the middle level provide breathing space (although the pulsating walls are a little annoying). Trapped exploda-fusion-bobs provide static entertainment.