Put digits in the empty squares such that in each row and in each column the digits 1-9 appear exactly once,
and they appear exactly once in the 3 × 3 "blocks".
Turn on "Error Checking" in the Settings menu for some extra help (duplicate digits then turn red).
Solve all three puzzles of one day (Light, Medium, and Heavy) and get a ! For each three Light puzzles you solve in one day you get a feather , for each three Medium a medal , and for each three Heavy an anvil ! Watch videos for extra puzzles.
Please send your feedback / bug reports etc. to email@example.com