Hype Sudoku
Classic 9×9 sudoku with a calm, phone-first board. Pencil in candidates, lean on free hints, and bank Neons for every correct number you place — switching puzzles never takes them away.
Sudoku: how to play, rules & tips
Play sudoku free online: classic 9×9 puzzles in easy, medium and hard, each with exactly one solution. Hints, undo and erase are unlimited, and there's no timer or mistake limit.
How to play sudoku
The grid has 81 cells, split into nine rows, nine columns and nine 3×3 boxes. Some numbers are filled in to start.
Fill every empty cell with a number from 1 to 9 so that each row, each column and each 3×3 box contains every number exactly once.
Every puzzle here has exactly one solution, so you never need to guess.
Easy, medium and hard puzzles
Pick a puzzle by difficulty. Easy puzzles give you more starting numbers and can be solved by spotting where a number has only one possible cell. Medium and hard puzzles give fewer numbers and need more careful elimination.
Stuck? A hint fills in one correct cell, and undo, erase and reset are always free.
Sudoku strategy tips
- Scan each number 1 to 9 across the grid and look for boxes where it can only go in one cell.
- Look for cells that can only take one number: check its row, column and box.
- Use pencil marks to note the possible numbers for a cell on harder puzzles.
- When two cells in a row, column or box can only hold the same two numbers, those numbers can be crossed off everywhere else in that group.
Frequently asked questions
Is this sudoku free?
Yes. HypeGameRoom is free: no sign-up, no download and nothing to buy to play. Arcade games reward Neons, a play-only currency that can never be cashed out.
Do these sudoku puzzles have one solution?
Yes. Every puzzle is checked to have exactly one solution.
Is there a time limit or a mistake limit?
No. Take as long as you like. Hints, undo and erase are unlimited.
What difficulty levels are there?
Easy, medium and hard.