Play Ultimate Sudoku online in your browser on AllDayGame. This page explains how to start the game, controls, and frequently asked questions. Category: Puzzle.
About (summary)
A puzzle game from Japan that has conquered the whole world. Fill in the empty cells with numbers from 1 to 9. In each row, column, or 3x3 block, each number can occur only once. 3 different game modes: Cell first: First click on the cell you want to fill in, and then select a number. Number First: first click on the number, and then on the cell in which you want to enter this number. Note Mode: Write down the option in an empty space using the keyboard or the number buttons.
How to play
Fill in the blanks with numbers from 1 to 9. Each row, column or 3x3 block, must contain the number 1 through 9 exactly once.
Game info
About this game
A puzzle game from Japan that has conquered the whole world. Fill in the empty cells with numbers from 1 to 9. In each row, column, or 3x3 block, each number can occur only once. 3 different game modes: Cell first: First click on the cell you want to fill in, and then select a number. Number First: first click on the number, and then on the cell in which you want to enter this number. Note Mode: Write down the option in an empty space using the keyboard or the number buttons.
How to play
Fill in the blanks with numbers from 1 to 9. Each row, column or 3x3 block, must contain the number 1 through 9 exactly once.
Controls
Mouse / touch: point and click or drag as the game requests. Keyboard: WASD or arrow keys are common for movement; Esc often pauses or exits fullscreen. On mobile, use on-screen controls if the game provides them.
Frequently asked questions
- Do I need to download anything?
- No. Games run in your browser via an embedded player. A stable internet connection helps.
- Is this game free?
- Yes — playing on AllDayGame is free for visitors. Optional accounts may exist for features like leaderboards.
- Why does the game not load?
- Some publishers block embedding on certain domains, or an ad-blocker may interfere. Try disabling strict blockers for this site or refresh the page. If Ultimate Sudoku still fails, contact us via the Contact page.
- Does it work on phones?
- Many games are mobile-friendly (compatibility varies by device; try on Wi‑Fi). If performance is low, close background tabs.
Tags
Explore more games in the category: Puzzle.