🔢 Number Grid Puzzle
Fill a grid so every row and column contains each number exactly once. 4 × 4, 5 × 5 and 6 × 6 puzzles, each with one solution.
How to play
Tap an empty square, then tap a number. Each row and each column must contain every number exactly once. If a number clashes with another in its row or column, it turns red. Look for rows or columns that are only missing one or two numbers.
⌨️ Keyboard: arrow keys choose a square, type a number to fill it, Backspace clears it.
What it teaches
Grid puzzles like this (called Latin squares) build logical deduction and systematic checking. Every puzzle is generated so it has exactly one solution, so it can always be solved by reasoning rather than guessing.
Levels: 4 × 4 (Numbers 1–4) · 5 × 5 (Numbers 1–5) · 6 × 6 (Numbers 1–6)
Free to play, with no sign-up and no ads beside the game. Best scores are saved only in this browser. All artwork and sounds are made in code by makekite.