One of the things I enjoy doing in RTS games is setting myself increasingly difficult challenges against the Skirmish AI. It's all well and good to stomp all over a single Easy opponent, but just how far can I take the stomping? Maybe I'm a little strange, but when you can't be bothered playing it against other humans, it adds a surprising amount of life to a game. Ordinarily these challenges only take place in the final versions of the game. I buy a new RTS, play some or all of the single...