onlinegamesbrowser.comHow to play
A sudoku grid splits into nine rows, nine columns and nine 3 by 3 boxes. Some cells come filled in: those are your clues. Complete the rest without repeating a digit in any row, column or box. Every puzzle here has a single solution, and reasoning alone gets you there, with no guessing.
- Choose a Level: Easy, Medium, Hard or Expert, or Daily for today's shared puzzle.
- Select an empty cell, then pick a digit from the pad underneath. Each pad key carries a small count of how many more of that digit the grid still needs.
- Not sure yet? Switch on Notes to pencil in candidates instead of a final answer.
- Keep going until all 81 cells are filled. The clock runs at the top, and Best keeps your fastest time.
Controls
- Touch: tap a cell, then a digit on the pad.
- Keyboard: click a cell, type its digit, and move with the arrow keys. 0 or Backspace clears a cell, N toggles notes, and undo is U or Ctrl+Z.
- Check is on when you start, so a wrong digit shows in red. Switch it off if you'd rather catch mistakes yourself.
- Hint fills in one cell and explains the reasoning. New puzzle starts another grid.
Tips
- Choose one digit and hunt for its spot in all nine boxes before you move on to the next digit.
- Go for the almost-full rows, columns and boxes first. They give up their last digits fastest.
- Tap a placed digit to highlight every copy of it on the grid. Gaps jump out.
- On Hard and Expert, keep notes. If two cells in a row can only be the same two digits, no other cell in that row can use them.
- Placing a digit tidies the notes in its row, column and box for you, so your pencil marks stay current.
FAQ
How are the levels decided?
Not by the number of clues. Each puzzle is worked through step by step the way a person would solve it, and the level reflects the hardest technique required. Easy only needs digits that have one possible place, Medium adds cells with one possible digit, Hard brings in pairs, triples and pointing pairs, and Expert can call for patterns such as the X-Wing and the Swordfish.
What is the daily puzzle?
Daily loads the puzzle of the day. Everyone gets the same grid that day, so friends can compare times, and a new one arrives at midnight, your local time.
Will I ever have to guess?
No. Every grid is checked before you see it: it has exactly one solution, and logic alone reaches it. Puzzles that would need a guess are never shown.
Can I play sudoku at school?
Sudoku runs in an ordinary browser tab with nothing to install, so a school Chromebook can play it. Whether the page opens on a school network is the school's call, and if it is blocked there, only the IT team can change that.
