Sudoku Calendar

Sudoku Calendar is a browser-based Sudoku game that turns daily practice into a simple routine. Instead of searching for a new puzzle every time, you can pick a specific day from the calendar and solve that puzzle, or start a random board when you just want a quick challenge. With adjustable difficulty, optional number helpers, and hints when you get stuck, it’s designed for both relaxed play and serious logic training.

Choose a date, solve the puzzle, improve your streak

The main idea is straightforward: open the calendar, select a day, and complete the Sudoku for that date. If you don’t care about the schedule, the random option gives you a fresh grid instantly. This format is great for players who like consistency (one puzzle a day) as well as those who prefer variety.

How to play

• Select a puzzle: choose a day from the calendar or start a random Sudoku.
• Fill a cell: click an empty square, then click a number to place it.
• Follow Sudoku rules: each row, column, and 3×3 box must contain numbers 1–9 only once.
• Adjust difficulty: switch between easy and hard depending on how much of a challenge you want.
• Use help tools: enable options like hiding impossible numbers for cleaner decision-making, and use hints if you need a nudge.

Core mechanics and useful tools

Sudoku Calendar keeps the classic logic structure, but adds quality-of-life features that make solving smoother on both short and long sessions.

• Daily calendar selection: return to a specific date puzzle, which is ideal for routine practice.
• Random puzzle mode: start a new board anytime without committing to the calendar.
• Difficulty control: pick an easier grid for warm-ups or a harder one for deeper deduction.
• Hide impossible numbers: reduces visual clutter by removing candidates that can’t fit a chosen cell.
• Hints: helpful when you’re stuck, learning patterns, or avoiding frustration late in a puzzle.

Tips and tricks for faster, cleaner solves

• Scan before you place: look for rows, columns, or boxes that are missing only one number.
• Work box-by-box: completing a 3×3 box often unlocks placements in connected rows and columns.
• Use the “impossible numbers” view as a tutor: it’s a good way to learn which constraints matter most.
• Keep guesses to a minimum: especially on hard puzzles, try to place numbers only when the logic is clear.
• Save hints for dead ends: if you can still make progress elsewhere, postpone using a hint until you truly need it.

Platform and controls

Sudoku Calendar runs directly in your web browser. On desktop, you’ll mainly use the mouse to select cells and numbers. On mobile devices like phones and tablets, tapping works naturally for the same actions, making it easy to play a daily puzzle wherever you are.

FAQ

Is Sudoku Calendar free to play?

Yes. You can play Sudoku Calendar for free in your browser.

Can I play Sudoku Calendar on mobile and desktop?

Yes. It works on computers and on mobile devices such as phones and tablets.

How do I enter numbers in the grid?

Click or tap an empty cell, then select the number you want to place.

What does “hide impossible numbers” do?

It reduces distractions by hiding number options that can’t legally fit in the selected cell based on the current board.

Who made Sudoku Calendar?

Sudoku Calendar was created by supernice.games.