This is pretty much how I solve regular puzzles too. I can do most 5x5s in under 20 seconds. Too often did my debugging sessions devolve into puzzle marathons =

This is pretty much how I solve regular puzzles too. I can do most 5x5s in under 20 seconds. Too often did my debugging sessions devolve into puzzle marathons =). Wrap variants are another story as they have no outer edges. Discovering which tile groups give initial clues there is pretty fun too (when the regular puzzles aren't much of a challenge any more).