Play activities should be novel; if an activity is mastered, free-form, low-stakes tinkering is advised.

“Now I came to that recommendation because of the literature that says, well, you need to engage something pretty repetitively. It should be novel. So this wouldn't be something that you are exceptionally good at already. If you insist on doing something that you're already exceptionally good at, then you want to really do some free form, low stakes tinkering.”