1. Random - Every player selects "Random Class" at the beginning of the mission. Stick to it for the rest of the mission.
2. Random House - Every player selects "Random Class" at the beginning of every wave, including after failed waves.
3. Full Random - Random classes with random loadouts (you'll need to have a loadout randomizer)
4. All ... - Everybody plays as a specific class. All scout, heavy, engi, etc. You might even specify a loadout. All bison soldier, demoknight, huntsman, etc.
5. No resistance upgrades.
6. No primary upgrades - Whatever's in your class's primary weapon slot can't be upgraded. You can use it, just no upgrading scatterguns, flamethrowers, miniguns, rocket launchers, engi shotguns (Sentries are not a primary!), medic needle guns (mediguns are a secondary!), revolvers, grenade launchers (sticky launchers are a secondary!) or sniper rifles.
7. No stock weapons.
8. Only stock weapons!
9. Short roster - using less than 6 players to complete a mission.
10. Specific team compositions. Engi, Scout, 4 Soldiers. Sniper, Spy, Engi, 3 demos. Anything to break the meta!
11. Anything you can think of that's new and different!