Maybe if it shared a similar concept to the WarioWare games. Each "arena" could be a different scenario or different type of DM minigame. Each minigame could have unique weapons or strategies and only last a short amount of time between 10 seconds or a minute, who knows. You could integrate and combine different concepts like:
- Underwater
- Flying/constant falling
- Melee only [instakill, or sword with multiple hits, duel mod with the special swords, etc]
- Flamethrowers
- Gatling guns
- No weapons except for stationary turrets and maybe a low-damage knife
- slow speed players with fast weapons VS fast speed players with ridiculously slow weapons [Slow projectile speed or fire rate, not sure]
- Snipers only
- Shotguns with a fun kickback
- Throwing knives that can be picked up
- pushbrooms/utilizing fall or impact damage
- [I'm not sure if it's an addon yet but] kills by jumping on other players' heads?
- Ranged only
- Surviving on foot VS vehicle driven players for a short period
- Constant health degradation (poison?)
- Falling platforms
- Crumbling arena [Like above]
- Low gravity
- No gravity
- Having to use a weapon that propels you to move around an enclosed arena
- Impact/Explosion weapons only
- Slo-Mo
- Fast-Mo
- being stationary with snipers, only being able to jump, crouch or stand
- Horses
- being on separate platforms across a gap
- Dodgeball
- Throwmod
- being in flying vehicles
- homing rockets
- only grenades
- Parallel vehicles on a track or a short death race
- Players on separate non-raycasted and transparent or translucent levels/floors of a map, having to fight above or below them, not being able to switch levels/floors. Either teams for each level or free for all
- Easy to use weapons with a very hard to survive in terrain or arena
- Hidden traps
- Visible traps
- mini players on default maps [Or enclosed areas of default maps]
- large players on default maps
- Large players with basic projectile weapons VS small players with big radius weapons [explosives]
- Small areas/sections of "Safe Zone" where all other space gradually hurts players
Mix and match all of these or even more [I just used things that are generally common or generic, or existing mods that can be combined in possibly fun ways] if you think of new things. I think it can make for some quick and consistent fast paced fun.