Custom Sudoku Sandbox

Welcome to the Custom Sudoku Sandbox! Enter numbers into the grid below to design your very own puzzle. Once you're done, you can generate a unique link and send it to your friends to see if they can solve it.

How It Works

1. Enter the starting numbers of your custom puzzle into the grid.
2. Click "Generate Share Link".
3. We'll automatically verify that your puzzle is mathematically solvable.
4. If it's solvable, we'll give you a unique URL to send to anyone!

Practice with Multiplayer Sudoku

After using the solver, test your skills in our multiplayer Sudoku game and apply what you’ve learned in real-time competition.