*Doom 3 (not RoE, no mods required)
*Works in Doom 3
*it must be done by jan 31st @ 23:59 EST (20:59 PST, 04:59 GST Feb 1st).
besides those, anything goes. Sign up over @ that d3w link & you'll be added to the list of entrants.
I'd love to see some really creatives ideas from people on this.