6×6 Sudoku

Rules

• Fill numbers 1–6 into the 6×6 grid.
• Each row, each column, and each thick-lined 2×3 box (total 6 boxes) must contain each number from 1 to 6 exactly once with no duplicates.
• Grey numbers are fixed clues and cannot be changed; brown numbers are your entries. Wrong numbers will be highlighted in red.

Controls

• Click a cell to select it, then tap 1–6 below to fill it. Tap Erase to clear the selected cell, tap Hint to auto-fill one correct cell.
• Keyboard: Number keys 1–6 for input, arrow keys to navigate, Backspace / Delete to erase.
• The small text below each digit shows how many more times this number can be placed on the board.

Difficulty

• Easy: More given clues, beginner friendly; Normal: Fewer clues; Hard: Most empty cells, requires advanced reasoning.
• Every puzzle is randomly generated and guaranteed to have only one unique solution.