Free Online Number Grid
A Latin-square puzzle where each row and column must contain each number exactly once — like Sudoku but without the 3×3 box constraint. Simple rules, satisfying logic. Choose your grid size and difficulty. No download needed.
How to Play Number Grid
- The grid starts with some cells pre-filled as clues.
- Fill the remaining empty cells with numbers.
- Every row must contain each number from 1 to the grid size exactly once.
- Every column must also contain each number from 1 to the grid size exactly once.
- There are no box constraints — only rows and columns matter.
- The puzzle is solved when every cell is filled correctly.
Difficulty Levels
- Easy — more clues given; most cells can be deduced directly from a single row or column scan.
- Medium — fewer clues; requires cross-referencing rows and columns together.
- Hard — minimal clues; demands careful candidate tracking across the whole grid.
Number Grid Tips & Strategy
- Start with rows or columns that have the most clues already filled in — they have fewer missing numbers.
- If a row is missing only one number, you can fill it immediately without any deduction.
- Cross-reference: a number that appears in many rows restricts where it can go in remaining rows.
- Use the Notes feature to track candidates in ambiguous cells.
- Work iteratively — each number you place may unlock other cells.
Frequently Asked Questions
- How is Number Grid different from Sudoku?
- Number Grid uses only the row and column constraint — there are no 3×3 boxes to satisfy, making the logic different and often more approachable.
- What grid sizes are available?
- Multiple grid sizes are available, scaling the difficulty of the Latin-square constraint.
- Is it free to play?
- Yes — completely free, no account or download needed.