Counterexample (working solution): https://imgur.com/a/VxDJc6M https://imgur.com/a/VxDJc6M, level 9 * all the tiles are used: yes * every part of every tile v

Counterexample (working solution): https://imgur.com/a/VxDJc6M https://imgur.com/a/VxDJc6M, level 9 * all the tiles are used: yes * every part of every tile visited: no. bottom right tile is not visited at all; the dangling path of the three-way tile is not visited * elegant: no. Dangling paths.