Fun game type I've played before it works like this:
1. Pre-game setup
--- Before game starts all items other than SMOKE grenade are restricted.
--- A few admins should bind a key so when they click it it gives EVERYONE a smoke nade
2. Pre-round setup
--- When game starts everyone is slapped to 1 hp.
3. How the game works:
--- Because everyone has 1 hp you can kill them in 1 hit with a smoke grenade
--- Admins give everyone new smokes every 5-10 seconds(faster/slower changes game... faster= more chaos // slower = more careful with nades)
--- Fight until no one on the other team is living!!!
Optional:
--- low grav
--- limited smokes(only 1 admin gives everyone a smoke ever 10+ seconds or so)