Free online anti-knight sudoku — easy difficulty
Anti-Knight Sudoku follows all standard Sudoku rules, plus one extra constraint: no two identical digits can be a chess knight's move apart (an L-shape: 2 squares in one direction + 1 square perpendicular).
In the diagram above, if the center cell contains a 5, then none of the red cells can also contain a 5.
New to Anti-Knight Sudoku? Our easy puzzles are the perfect starting point. Each easy Anti-Knight Sudoku puzzle comes with around 40 pre-filled digits, leaving you plenty of logical paths to explore without feeling overwhelmed. This is the ideal difficulty for learning how the knight constraint interacts with standard Sudoku rules.
In easy Anti-Knight Sudoku, you can solve most cells using simple scanning techniques: look at a row, column, or 3×3 box and find a digit that has only one possible location. The knight constraint adds a helpful hint rather than a difficult obstacle — use it to eliminate candidates that standard Sudoku logic might leave ambiguous.
Start by placing the most frequently occurring digits first. When you place a number, immediately visualize the 8 cells a knight's move away and mentally mark that digit as forbidden there. Our game helps by highlighting knight-reachable cells when you select any cell on the board. Once you're comfortable with easy puzzles, try medium Anti-Knight Sudoku for a greater challenge.
All our puzzles are completely free to play, no registration required. Each puzzle is uniquely generated and guaranteed to have exactly one solution. You can play as many easy Anti-Knight Sudoku puzzles as you like, any time of day. For more challenge, explore hard Anti-Knight Sudoku or expert Anti-Knight Sudoku.