Sudoku Calendar Game

Sudoku Calendar brings a daily ritual to the classic 9x9 logic puzzle. Instead of staring at an endless list of random numbers, players are greeted by a calendar where each day holds a new, unique puzzle. Completing daily grids helps players build a regular solving habit, track their progress over the month, and gradually unlock a special monthly illustration.

The game offers a polished, minimalist environment built to keep your focus entirely on logic. With smooth touch and click inputs, the interface operates seamlessly on both mobile devices and desktop browsers. Whether you want to warm up your brain with a quick morning challenge or unwind at the end of the day with a more complex grid, the calendar structure gives every solved day a satisfying sense of progression and completion.

Controls

• Mouse / Touch: Click or tap any cell in the 9x9 grid to select it, then choose a number (1-9) from the on-screen keypad to place it.
• Pencil (Notes): Click or tap the pencil icon to toggle note-taking mode, letting you write multiple candidate numbers in a single cell.
• Eraser / Undo: Select a cell and use the eraser tool to clear a number, or use the undo button to reverse your previous moves.
• Hints: Tap the lightbulb icon to reveal the correct digit for a selected cell if you find yourself completely stuck.

Tips

• Complete daily streaks: Try to solve puzzles consecutively to maintain your daily calendar streak. If you miss a day, you can always go back to the archive and complete past dates.
• Use notes for tricky boxes: When playing on harder difficulty tiers, use the pencil tool to write down candidates in the 3x3 subgrids. This prevents guessing and helps you spot naked pairs.
• Focus on heavily populated digits: Look at the board to see which numbers are already placed the most. Scan their respective columns and rows to quickly find where their final instances must go.