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This is a fantastic game.

I’m curious, did you use a special coordinate system for the hexagons or did you just make it work without any sort of coordinate system at all?

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I didn't use any special coordinates, just some trigonometry. My code transforms coordinates between (x,y) - for drawing, (row, column) - for finding neighbours and (index into an array of tiles) - for managing state. It sort of grew organically and could probably be cleaned up a lot.

The hardest part was making the board repeat for the wrap variant making sure that all tiles have consistent wrap neighbours. I almost deployed a version that worked fine on odd-sized grids and went completely bananas on even-sized grids. The danger of always testing on a 5x5 board)).

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