My son is 9. He is reading Ben Orlin's Math Games with Bad Drawings, and he picks the next game. I build that one with a model in the editor. The model is fast at a first version. It is careless about where the truth lives, and it will write that truth down twice. So the work I keep is short. I write the decision in a file, I choose which machine owns the rules, and I play the position the first check gets wrong. By 1 October, four games were playable in the browser. The notes are dated, s...