you know, this might actually be hella fun if there was guns and such. hear me out...
you spawn. you get a weapon of some sort, maybe random, maybe 2. the floor opens, and you fall.
you have maybe 5-10 seconds to kill as many people as you can, to get a higher score/better weapon.
everyone lands, living or not.
(eww...)
you respawn. and do it all again.
now, some things you could throw in for variety. maps, with different mid-air (mid-pit?) obstacles. like, i dont know, crossbars or meat hooks or saw blades or something? or maybe jacuzi vents, that push on you. Also, some sort of freefall recoil. so if you shoot a shotty, you go tumbling end over end backwards... you'd need some sort of way to counteract this effect, like, air-control or something.
eh eh? this'd be f'ing hilarious.
(oh, scoring. 1 point for a kill mid-air, 1 point for surviving to the bottom.)
oh, and you could call it "The Pit: Tactical Suicide" or something.