This was the list I found are there more? FIFA '96: 6 players Guardian Heroes: 3 players (isn't it 6 players in arena mode?) Madden '97: 8 players Madden '98: 8 players NBA Action '95: 8 players NBA Live '97: 10 players NFL Quarterback Club '96: 12 players NFL Quarterback Club '97: 12 players NHL '96: 6 players NHL All Star Hockey: 12 players Street Racer: 8 players Worldwide Soccer: 6 players I left off Bomberman since I established else where that I am planing a 10 player battle to the death!
It was included with Duke Nukem 3D, but I believe you had to have a Quake savestate in order to access it. Is Death Tank Zwei (came with Exhumed) featuring this multiplayer goodness, too? I can't remember, only played it with two players back then.
Death Tank is in Exhumed (aka Seireki 1999 aka Poweslave), collect the dolls. Death Tank Zwei is in Duke Nukem 3D, destroy all toilets OR have a Quake save. From memory you can have up to 7 players in each. Edit - ninja'd slightly by ave!
