The problems are very challenging, but that shouldn't stop you from thinking about them and then enjoying the enlightenment of the answers after a minute. Very helpful material! Best of luck in your pursuit of a better game
Funny you should mention that. Right after you talked about shapes, I browsed through Sensei's Library and saw that too. Thanks for the recommendation.
I'm glad you said something about shape. It's something I'm stumbling through right now.