XCOM2 Multiplayer against AI

[Gazzzah]

A skirmish mode. I think it'd be fantastic. A good way to test out different strategies. Nice, contained, single missions.

[Dragon32]

There's Wave COM (on Steam Workshop) but that's single player vs AI

 

There's also a co-op mod (Workshop again) but I've never tried it, some had success and others didn't

 

Then there's the built-in Tactical Quick Launch option (needs a console command I think).