Guide
How to play Summit Sudoku
Summit Sudoku is Trailhead's daily sudoku: fill the 9x9 grid so every row, column and box holds 1 to 9 with no repeats. Free in the browser, with a timer, plus a Killer variant for a deeper challenge.
Play now · Summit SudokuHow to play
- 1Pick an empty cell and the number you think fits.
- 2Every row, column and 3x3 box must contain 1 to 9 with no repeats.
- 3Use notes to pencil in candidates when a cell has several options.
- 4Complete the whole grid with no conflicts to finish and log your time.
Tips to score higher
- Look first at cells with the fewest candidates: they often have an immediate unique answer.
- Scan by number: see where the 1 can only go in each box, then the 2, and so on.
- Try Killer mode (cages with a target sum): it removes clues and forces deeper reasoning.
Frequently asked questions
- Is it free with nothing to install?
- Yes, it plays in the browser with no install and no payment. An account is only for the online leaderboard and syncing.
- What is Killer mode?
- A variant where each cage of cells must sum to a target with no repeats, on top of the normal sudoku rules. It adds a lot of deductive depth.