Sudoku is a logic puzzle where you fill a 9×9 grid with digits 1 to 9 so that every row, column and 3×3 box contains each digit exactly once. A new puzzle is generated every time, and your best time per level is saved.
Rules
Every row, every column and every bold 3×3 box must contain 1–9 with no repeats. The starting numbers cannot be changed.
Solving tips
Start with cells that can only take one number. Look for a digit that fits in just one spot inside a box. When stuck, scan one line at a time and list the candidates.
FAQ
- How do the levels differ?
- By the number of empty cells: Easy 36, Medium 46, Hard 54.
- Does it show mistakes?
- Digits that repeat in the same row, column or box are shown in red. Fill every cell by the rules to finish.
- Can I use the keyboard?
- Yes. Select a cell, type a digit, move with arrow keys and delete with Backspace.
- Is it free?
- Yes, unlimited free play with no install or sign-up.
