Free daily sudoku online: clean puzzles, no clutter
SudokuGlyph is a free daily sudoku you can play online. Classic rules, clean interface, no ads covering half the screen. Just a grid, your brain, and that satisfying moment when everything clicks into place. New puzzle every day in Easy, Medium, and Hard.
What is sudoku?
Sudoku is a logic puzzle played on a 9×9 grid. The grid is divided into nine 3×3 boxes. Your goal is to fill every cell with a digit from 1 to 9, following one simple rule: no digit can repeat in any row, column, or 3×3 box.
Some cells start filled in. These givens constrain what can go where. The puzzle is solvable through pure logic. No guessing required. Every sudoku has exactly one solution.
How to play SudokuGlyph
The controls are straightforward:
1. Tap a cell
Select any empty cell on the grid. It highlights so you know where you're working.
2. Enter a digit
Tap 1 through 9 on the keypad. The digit fills the cell. Use Erase to clear it if you change your mind.
3. Use notes for candidates
Toggle Notes mode to place small pencil marks. These help you track which digits could go in a cell before you commit.
Features that make solving easier
SudokuGlyph has a few tools to help you solve without taking over the puzzle:
Conflict highlighting
Turn on Conflicts and the game highlights any duplicates in the same row, column, or box. Helps you spot mistakes immediately.
Notes mode
Place small candidate numbers in cells. Essential for harder puzzles where you need to track multiple possibilities.
Undo
Made a mistake? Undo steps back through your moves. Works for both regular entries and notes.
Optional assist tools
If you want a bit of help, there are optional tools. Using them counts in your stats, so purists can avoid them and still track their "clean" solves.
Auto Notes
Fills in pencil marks for all empty cells automatically. Shows every digit that's still possible in each cell based on current state.
Candidates
Shows which digits are valid for the currently selected cell. Useful when you're stuck and want to see your options.
Check
Validates your current entries against the solution. Highlights any mistakes so you can fix them.
Three difficulty modes
SudokuGlyph has Easy, Medium, and Hard puzzles. Each is a different puzzle for the day, so you can play all three if you want.
Easy
More givens, straightforward logic. Great for beginners or a quick solve. Most people finish in 5 to 10 minutes.
Medium
Fewer givens, requires more deduction. You'll need to use notes and think a few steps ahead. Typical solve time: 10 to 20 minutes.
Hard
Minimal givens, advanced techniques required. You might need strategies like naked pairs or hidden singles. Can take 20 minutes or more.
Sudoku strategy tips
Here are some techniques that help with harder puzzles:
Scan rows and columns
Look for rows or columns that are nearly complete. If 8 digits are placed, the 9th is obvious.
Box by box
Focus on one 3×3 box at a time. Find digits that can only go in one cell within that box.
Use pencil marks
Write candidate digits in empty cells. When a cell has only one candidate left, that's your answer.
Hidden singles
If a digit can only go in one place within a row, column, or box, it must go there, even if that cell has other candidates.
Why play daily sudoku?
Sudoku is one of the most studied puzzle types for cognitive benefits. Regular play exercises logical thinking, pattern recognition, and working memory. You're constantly holding constraints in your head and testing possibilities.
The daily format helps build a routine. One puzzle a day is sustainable. It's not a grind through hundreds of puzzles. Just a focused mental exercise you can do with your morning coffee or during a break.
There's also something satisfying about the daily ritual. Same time, same puzzle format, but a fresh challenge each day. It becomes part of your routine.
SudokuGlyph vs other sudoku sites
There are hundreds of sudoku sites out there. Here's why I built another one:
Most sudoku sites feel cluttered. Ads everywhere, tiny grids, clunky controls. I wanted something I'd actually enjoy using every day. SudokuGlyph is that: a clean, focused sudoku experience without the noise.
Play SudokuGlyph now
Today's puzzles are ready. Pick a difficulty and see how fast you can solve it.
More free daily puzzles
SudokuGlyph is part of the GlyphVerse, a collection of free brain training games. If you like sudoku, you might also enjoy:
NumberGlyph
A daily number deduction puzzle. Guess the secret number using logic and mathematical clues. Like Wordle for digits.
Play →HieroGlyph
A code cracking puzzle. Deduce what each symbol equals using equations. Pure logical deduction.
Play →ConnectGlyph
A connections style word puzzle. Find 4 groups of 4 words that share a hidden theme.
Play →Questions or feedback? DM me on X @numberglyph.