Quick start

This Sudoku page is built for practical solving. Difficulty, filled cells, and mistakes stay visible in the panel, and draft mode is there when the puzzle stops giving obvious singles. The cleanest way to use the page is to solve in a steady order instead of jumping around the grid at random.

Rules and controls

A solved board places digits 1 through 9 in every row, every column, and every 3x3 box without repetition. Given clues cannot be changed. Tap or click a cell, then use the keypad to enter a number. Draft mode lets you place smaller candidate notes in open cells when the answer is not certain yet.

The round is won when the whole grid is correct. Use normal mode for confirmed placements and draft mode when you need to narrow candidates without guessing.

Beginner tips

• Use a fixed scan order. Repeating the same row, column, and box routine makes singles easier to notice.
• Add notes only after direct scans stop producing clean moves.
• Clear stale notes after every confirmed placement so the board stays readable.
• If you feel stuck, scan one digit across the whole grid or rebuild one crowded 3x3 box carefully.

FAQ

Should I use notes on every puzzle?

No. Use direct scans first, then bring in notes when the board actually needs reduction work.

What should I do when I feel stuck?

Pick one digit and scan the whole board for it, or focus on one crowded 3x3 box and rebuild the candidates carefully.

Is speed important for beginners?

Only after the solving process is dependable. Accuracy and readable notes matter more at first.