Somewhat Double or Nothing, but with DooM monsters.

[definitelynotdot]

Everyone starts out with a Zombieman, They can "trade" with other people (deathmatch eachother or just do a good-ol coin flip) for a chance to steal their monster or lose the one they're trading with, If you have two of any monster, you can merge them to get the next one in the tier list. If you run out of monsters, you will be guaranteed to always have one emergency zombieman on hand at any given time. Once you got two monsters or a higher-tier monster, you can't use that anymore. That way, it's actually somewhat possible to get to Doomguy tier (thanks to lollipop for pointing that one zombieman at all times bit out)
Tier List Zombieman > Shotgunguy > Imp > Chaingunner > Pinky Demon > Spectre Demon > Hell Knight > Baron of Hell > Arachnotron > Spider Mastermind > Cyberdemon > Archvile > Doomguy


And remember, it's double or back to square one.



(sorry if i mess up the tier list)
If you have any problems with the game's formula or something just plain isn't right, feel free to shoot me a DM.