Start simple: learn the rules, build habits, then level up with SudokuFresh.
Fill a 9×9 grid so every row, column, and 3×3 box contains the digits 1–9 exactly once. No math required — pure logic.
Read the beginner guide →A cell with only one possible digit. The simplest elimination — scan peers to find it.
Practice in Beginner →A digit that fits in only one cell within a row, column, or box — even if the cell has other candidates.
Practice in Beginner →Two cells in the same unit share the exact same two candidates. Those digits can be eliminated from all other cells in that unit.
Practice in Intermediate →