[criddell]

Thanks for replying. Maybe I just have a dumb bug in my logic and should take another crack at it.

[Cogito]

I know I had issues keeping track of how many steps I’d taken, but making sure I was generating a good set of neighbours helped with that.

Otherwise it was just making sure I got the rules right, like all AoC problems, and testing different cases to make sure my solution did the right thing.