The launcher mentions sandbox/solo option, but I can't find it? I'd like to at least be able to figure things out before jumping in to an online match and wasting other peoples time, how do I do this?
Just Create Game in matchmaking and slam the Ready button before anyone else can join. The game will launch with AI-only. Bear in mind, if you played Total Annihilation or alternatively Supreme Commander, PA will feel nostalgically familiar. ATM, testing is best done with Matchmaking so Uber can start stabilizing the networking.