There are free chess games online with varying difficulty levels but you can also buy a chess set and play with your family or friends. (consumerhealthdigest.com)
Since the exercises come in varying difficulty levels, it doesn't matter if you've never worked out before in your life. (rushfitxercise.com)
You would have to be fast asleep to manage a game over in this preview version, but I expect varying difficulty levels in the full release. (vrpill.com)