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All the logic, half the grid. Fill every row with digits 1 through 6 and solve in minutes.
Same goal as classic sudoku: fill every row, column, and region with the required digits, no repeats. The grid is just smaller, so you finish faster. A 6×6 takes a few minutes once the patterns click.
6×6 boards use digits 1–6 in six 3×2 regions. Tap an empty cell, then tap a number 1 through 6 to fill it in. Every row, every column, and every bold-bordered region needs each digit exactly once.
Once you've cleared a few mini grids, step up to the full 9×9 board for a deeper challenge.