Tank vs Tank game where field of competition is dark, but tanks have an abundance of flourescent shells to light up the target area.
3D OpenGL game ...
maybe 'BZFlag in the dark'
Initially, will be solo game with AI for the computer player, but eventually will be networked. I dont trust any networking lib well enough to commit to making it work within a 1 week contest.
AI will be limited, necessarily, with multiple opponents to compensate.