I think my favorite solo game like this was the one I had back when I was a pitcher in little league. I had a sort of angled net/trampoline to practice throwing pitches at. If you have it set at the right angle and put it at the right distance and throw the ball in the right spot it will casually bounce the ball right back to where you are standing. It was quite fun when you get a good rhythm going.

Today’s Maximumble makes an effort.