The recent explosion of solitaire board games has been great fun. Back in the day I had B-17 Queen of the Skies, which was fun but frustrating as I never got past 12 or 13 missions. Today there's an entire industry of solitaire games, some more fun than others but all imaginative and fairly easy to play. Interceptor Ace and American Tank Ace are two that I picked up recently. Another one is Don't Tread On Me, the American Revolution and you play as the British which is interesting. And all the "Leader" games -- Sherman Leader, Zero Leader, U-Boat Leader, Gato Leader are on my shelf and there's lots of others. One recent game that looks intriguing is Lanzerath Ridge, very tactical level defense against a German attack during the Bulge. Especially if you don't have human opponents nearby the solitaire games are a great alternative.