Since this is a fairly unique aspect of Gratuitous Tank Battles
, I thought it was worth reiterating... As with the original GTB
, the main gameplay is single player. You can play against scripted A.I. or adaptive A.I. and you can choose to attack or defend. There are three difficulty settings, but these only have an effect when you play against the adaptive A.I., since the scripted stuff is, well, scripted.
Is there multiplayer? You betcha! Well, sort of. You see, it's like this... yes, you can play a challenge set by other players, but this challenge is created by recording their gameplay on one side, then when you play the challenge, you take the other side and try to defeat them. So, I guess this could best be described as "asynchronous" multiplayer, in that you're not going to interactively play against someone in realtime. Still, the player challenges provide a lot of replay value above and beyond the stock missions included in the expansion. Just remember that if you want to restrict players to WWI units, make your challenges using the first four maps.