Too many games! Too many games! How can you have too many games?!?
I played it solo just last weekend and it works fine. There's the normal reluctance to mess up one's own plans (four times over!) and the tendency to give a bit of slack to one's favorite color. I ended up with two nearly completely forested mountains and a rush to the finish with a surprising victor. I also got a lot better at using the helicopters and other tools. Next time out the grizzly bear is going to hit the board.