My partner publishes crosswords and it's always fun to see how much artistry goes into authoring a puzzle. You can play with the structure/grid, the theme of course, every minute detail of the fill, etc.
Never would have thought of a Mobius-strip though, insane.
Each edge of the ribbon was a linked list, connected to each other by rungs. It looped back on itself but connected crosswise .
Then if you nuked all the rungs it was clear you still got a connected piece that you could traverse over.
Never would have thought of a Mobius-strip though, insane.