Found a bug, a puzzle that seems wrong, or a hint that didn’t make sense?
Is every puzzle solvable without guessing? Yes. Every puzzle has exactly one solution and is graded by the hardest technique it needs.
Why does a hint ask me to turn on Auto Pencil? Most hints past singles remove candidates, which only makes sense when all of them are shown.
Do hints and reveals affect my stats? A game counts as a clean solve only with no hints, checks, reveals or assists.