4.  Thrill Kill - Virgin Interactive, 1998 (almost) - PlayStation

Probably the most infamous unreleased game of the last decade, if not ever, Thrill Kill was to be the first four-player fighting game for the original PlayStation... until The Man stepped in and ruined everybody's gory fun.

Characters trapped in Hell fought each other in torture chambers, padded cells and bathrooms for the chance to return to their previous life. Instead of hoarding health, players used aggression to fill a Rage meter; the first player to fill theirs got to kill one of the other characters, usually via decapitation, electrocution or mashing their face into a bloody mess.

Above: The interesting thing about Thrill Kill is that, had it actually come out, everyone would have realized it pretty much sucked.   

It was low-res, nasty, hilariously over-the-top, and full of big blocky red pixels that were supposed to be blood. While naughty gamers have acquired bootleg copies here and there, Thrill Kill never made it to stores because of corporate shenanigans: Electronic Arts bought publisher Virgin right before the game was set to release and buried it forever (though much if it showed up in the Wu-Tang Shaolin Style fighting game), essentially saying Thrill Kill was too sick to survive. Makes you want it even more now, right?