About iLoveSudoku

iLoveSudoku is a free killer sudoku site. The board on the homepage is the product. Everything around it — the daily puzzle, the combination table, the strategy notes, the printable sheets — exists so that a person can start, get stuck for a fair reason, and come back tomorrow.

Each puzzle has a permanent number. The number does not contain the difficulty, because a puzzle can be refiled if players’ times say we graded it wrong, and the link should keep working. We do not reuse numbers and we do not delete a puzzle that has been shared. If a board is wrong, we mark it retired and take it out of circulation.

Difficulty is the hardest technique a logical solve needs, plus how often that technique appears. Easy stays on singles. Medium adds the 45 rule or a pair. Hard and expert repeat the heavier cage ideas. Two different solvers have to agree there is one solution before a number is assigned.

The site is operated by GUCCI under the name iLoveSudoku, at ilovesudoku.app. Write to hello@ilovesudoku.app.