OK, or not.

[RedMettaur16]

I can get my maps to work 100%, but, they will no matter what instantly swap to cooperative. Why is that?

[Russel]

If that is through Doom Builder, then that's default.

If it is not through Doom Builder and you are using the map command, such as "map mm1cut", then you will, no matt1er what get campaign, it's just the way the game works.

To access the maps in any given game mode, go to multiplayer menu, and then Offline Skirmish, doing so allows you to choose any map from any game 1~7 as well as the game mode and game modifier. (Which the only modifier that has anything happen is Buckshot)

Available modes in the spoiler

(click to show/hide)

Main Modes:
Deathmatch: Offline it's just like the campaign, but you can have as many bots as you want ans change whatever settings, play until the fraglimit is reached.
Team Deathmatch: Deathmatch with teams
Last Man Standing: Like deathmatch, but instead you live only once until the round is over, last one alive wins the round, continue playing multiple rounds until the winlimit is reached. removes all weapons and pickups from the field and gives the player 5 random weapons.
Team Last Man Standing: Last Man Standing with teams.
Duel: Like a 2 person deathmatch (Has crash problems)
Cooperative: unavailable
Survival Coop: unavailable
Possession: Pick up the circuit board and keep it for the allotted time limit, if you die with it, the timer restarts and you drop it
Team Possession: Protect the holder of the circuit board from the opposing team
Terminator: Pick up the Terminator Rune and your attacks get quad damage, kill people until the fraglimit, but if you die to map-based causes (like Force Beams or Lava) you lose 10 frags
Capture the Flag: Run to the opponents' base and get their flag, come back to your base and deliver it. But, if your team's flag is not there, the point cannot and will not be scored until it is returned
One Flag CTF: Grab the white flag (center of the map) and take it to the opponent's base. Note that you cannot take the other team's flag, nor can they take yours.
Note for CTF and One Flag CTF, you need to play on special maps
Domination: unavailable (as far as I know...?)
Skulltag: unavailable
Teamgame(ACS): unavailable
Invasion: unavailable

Modifiers:
Buckshot: removes all weapons and pickups from the field, nothing more
Instagib: removes all weapons and pickups from the field and gives everyone to ever exist a weapon that shoots metal blades that OHKO everyone they hit.

NOTE: All above conditions only occur in vanilla, mods can change what each mode does.

also, you can add bots to the game using the botlist function.

If you ever instand to play online, you may want to get Doomseeker or Internet Doom Explorer and look at Ivory's uber list of mods. Although, the list is a little bit outdated now.

[RedMettaur16]

OK! Lock.

[RedMettaur16]

HOLD UP!

I've done it before, but it just swaps to coop anyways with offline skrimish!

[Korby]

Did you set it to a different mode?

[Gummywormz]

Are you putting deathmatch starts in?

[RedMettaur16]

I set the mode to deathmatch on offline skrimish, but suddenly, POOF! Mod is coop, and not deathmatch.

[RedMettaur16]

I set the mode to deathmatch on offline skrimish, but suddenly, POOF! Mode is coop, and not deathmatch.

*fixed error

[Dusk]

Skulltag defaults to cooperative if there's a player 1 start in the map. If the map only contains deathmatch starts and no player 1 starts, it will default to deathmatch.

[RedMettaur16]

Skulltag defaults to cooperative if there's a player 1 start in the map. If the map only contains deathmatch starts and no player 1 starts, it will default to deathmatch.

But that makes it say that there is an error which is "No player 1 start" and the map just doesn't load.

[RedMettaur16]

Hold up, think I found it...

[RedMettaur16]

Uhh, 100 hours later... Sorry I haven't been active, but I still need to test this. THIS HAS GONE NOWHERE!