@lance: Just a thought → It might be really interesting to save the old version of the game at that point in the book (the one you’re currently rewriting to be different), to be able to compare it with the new one. For me, many good insights come from looking at ‘This is one way we could do X, here are the pros/cons’, and ‘This is the idiomatic (IMO) way to approach doing X, it has these pros/cons’. I don’t know whether that fits into the structure of the book, but if not directly in there, then maybe as an errata / some way to be able to compare the code of both approaches at the same point?
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