Hard boards stop giving you easy singles. You clear notes with pairs and triples, and with colors locked inside one block or one line, until a single appears. Same rules as any sudoku, with nine colors in place of the numbers.
Levels: Easy · Medium · Hard · Expert · All levels
Every day brings one new board, the same for every player. Finish it, see how your score compares, and share your result without spoiling the board.
On top of everything Medium uses, Hard boards need Pointing Pairs, Claiming Pairs, Obvious Pairs, Hidden Pairs, and Obvious Triples. Each one has a short animated lesson.
A hint doesn’t just fill in a cell. It names the technique and walks you through why the move works. Every technique also has its own animated lesson, and the two-minute tutorial covers the basics.
Open it and play. Also on the App Store and Google Play.
Clears your saved best score for every difficulty in this browser. Nothing else is kept here.
