Sudoku Calendar Game

Sudoku Calendar brings the classic 9x9 logic puzzle into a daily format, offering a brand new grid to solve for every day of the year. The game provides a structured way to practice Sudoku, letting you select the current date to play today's challenge or browse back through previous months to fill in any days you missed.

A typical session involves choosing a difficulty level—ranging from easy grids that take a few minutes, to expert puzzles that require advanced logic to crack. It runs directly in the browser with nothing to install, providing a clean interface where you can quickly enter numbers, toggle pencil marks for candidate digits, and undo mistakes without managing physical paper.

Controls

You can play entirely with a mouse or touchscreen.

• Select Cell: Click or tap any empty square on the 9x9 grid.
• Enter Number: Click a digit from the on-screen number pad to fill the selected cell.
• Pencil Marks: Toggle the notes mode to input small candidate numbers instead of a final answer.
• Erase/Undo: Use the on-screen buttons to clear a cell or step back your recent moves.

Tips

• Scan the board for numbers that already appear frequently to easily spot their remaining valid placements in 3x3 boxes.
• Make use of the pencil notes tool for cells that only have two or three possible options; it saves you from having to memorize them as the board fills up.
• Focus on rows, columns, or 3x3 blocks that are almost entirely filled first, since they have the fewest remaining possibilities.

This is an excellent fit for anyone who enjoys daily puzzle habits and wants a straightforward, distraction-free way to practice logical deduction.