Variable Size Sudoku

2026/9/26: Added "Share on X" and "Share on LINE" features.

【How to Play】
①Select a square ➔ ②Enter a number/color from the buttons at the bottom of the screen or use keyboard input

【Overview】
A familiar Sudoku puzzle that you can enjoy in any size you like by arranging numbers to spark your mind!

You can choose a board size from 2×2 to 20×20, so it's perfect for quick one-minute games during spare moments or for tackling ambitious large puzzles.

Difficulty comes in three levels: "Easy," "Normal," and "Hard." The appearance can be customized from four themes—Classic, Dark, Pastel, and Retro—depending on your mood. You can also adjust the text size, so even large boards remain easy to read.

The gameplay is simple.
Just select a square and enter a number using the number buttons or keyboard.
With the keyboard, 1–9 work as-is, 0 corresponds to 10, and Q through P correspond to 11–20, so you can fill in large boards smoothly.
If you're stuck, use "Memo" to jot down candidates discreetly, and use "Color Highlighting" to color-code squares and organize your deductions.
If the same number appears twice, it turns red to alert you, and you can undo up to 30 moves back, so you're safe.
When you're really stuck, use "Hint" to peek at the answer for just one square.

The timer can be paused, and your personal best for each size and difficulty level is recorded.
Your progress is automatically saved, so you can pick up where you left off even after closing the app.
When you complete a puzzle, confetti celebrates your victory 🎉 Now go fill in the next square!