Arcadeum
Online Gaming Arena
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Online Gaming Arena
The classic 9×9 logic puzzle with hand-tuned difficulty levels, pencil marks, and zero ads in your way.
No accounts, no waiting rooms — a fresh unique puzzle in one click.
Close the tab mid-solve and your grid is exactly as you left it.
Every finished grid feeds your Arcadeum stats dashboard automatically.
Easy grids hold about forty clues; hard ones drop to around twenty-six.
Find where a digit fits by elimination — tap the cell, then tap its number on the pad.
Use Notes to track candidates and fill in every cell from 1 to 9 without repeats.
Fill the entire 9×9 grid so that every row, every column and each 3×3 box contains the digits 1–9 exactly once.
Tap a cell and pick a digit from the pad or keyboard. Switch to Notes mode to jot candidate numbers before committing.
Wrong entries count as mistakes but stay on the board for you to fix — a clean, quick solve is the goal.
Yes — Sudoku on Arcadeum is completely free, requires no download, and needs no account to start playing.
Yes. Every generated puzzle is verified to admit exactly one solution — you can always reason your way to it.
Absolutely. The number pad is touch-friendly, and Notes mode lets you jot candidates just like on paper.
Fill each cell in the 9×9 grid so that every row, column, and 3×3 box contains numbers 1 to 9 with no repetition.
Toggling Notes mode lets you pencil in candidate digits in empty squares, making it simple to track possibilities and spot patterns.
A naked single is a cell with only one valid digit remaining, while a hidden single is a digit that can only appear in one position in a unit.
Never. Every board on Arcadeum is mathematically proven to have a unique solution that can be reached purely through logic.
Choose from Easy (introductory), Medium (balanced reasoning), and Hard (demands advanced deduction techniques).
Yes. Optional conflict highlights immediately show duplicate digits in rows, columns, or 3×3 boxes to help you learn.
Yes. Every successful solve is tracked by the built-in timer and recorded in your personal Arcadeum performance stats.
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