From the little we've played of Gloomhaven I can safely say it's one of the most strategic turn based RPGs I've ever played. There are several points of evaluation and decision making that go into every turn. You'll need to consider turn order, balance against card draws for abilities, chance that against modifier cards for every action, and of course all of that up against whatever the enemies that vastly out number you do with every turn.

This version of the title has been in development for some time, but it wasn't until recently that the devs confirmed there would be co-op in this dungeon-crawling, tactical RPG. The way it works is that the host will invite other players into their game and assign one character to each player (four players max in one game). If you don't have enough players for all your characters, then the host will control the remaining ones. It's worth noting that while there is character progression in some of the game modes, all of this will be tied to the host's account; you are going on an adventure after all.