Multiboard Sudoku

How to play

Every 9 by 9 grid follows the usual sudoku rules: each row, column and 3 by 3 box holds 1 to 9 once. Shared boxes belong to two grids at once, so they must work for both. Tap a square and then a number; Notes mode adds pencil marks. Your puzzle is saved as you go, and Zoom helps on phones. Play 100 levels that move from Twin to Samurai boards with fewer clues, earning stars for solving, making three mistakes or fewer, and beating the target time.