Sudoku

Sudoku: A Number Puzzle for Every Skill Level

Sudoku is a logic puzzle game where every number has a place and every move brings you closer to a complete grid. In a standard puzzle, your goal is to fill the empty cells so that each row, column, and 3×3 block contains the numbers 1 through 9 without repetition. The starting numbers provide the clues, and careful observation helps you work out the rest.

This version offers several difficulty levels, a larger Giant puzzle option, and Daily Challenges. You can choose a quick game, practise the basics, or settle into a demanding puzzle. Tools such as Notes, Undo, Erase, and Hint help you manage your progress as you play.

Fast Difficulty

Fast difficulty is a good choice when you want a short Sudoku session. It gives you an approachable way to practise scanning the board, spotting missing numbers, and recognising straightforward placements. Instead of rushing through guesses, look for a row, column, or block with only a few spaces remaining.

Use this option as a warm-up before trying a harder puzzle or whenever you want a manageable challenge during a break. A quick puzzle can still reward careful thinking, especially if you try to complete it accurately while using fewer hints.

• Suitable for shorter play sessions.
• Useful for practising basic number placement.
• A comfortable starting point before moving to higher difficulties.

Easy Difficulty

Easy difficulty introduces the familiar rhythm of Sudoku at a comfortable pace. Study the numbers already on the board, then compare each empty cell with its row, column, and block. When only one number can fit, you have found a placement supported by logic.

This level suits beginners who are learning the rules and returning players who want a relaxed puzzle. It is also a useful place to practise working methodically. Filling one cell can reveal another answer nearby, allowing you to build a chain of correct moves across the board.

Medium Difficulty

Medium difficulty offers a step up once the easier puzzles begin to feel familiar. You may need to compare several parts of the board before deciding where a number belongs. A cell that looks uncertain at first can become clear after you solve something elsewhere.

Notes become especially helpful here. Record possible numbers in an empty cell, then revisit those candidates as the puzzle develops. Medium difficulty encourages you to balance direct placements with elimination, building confidence without immediately moving into the most demanding puzzles.

• Compare possibilities across connected rows, columns, and blocks.
• Use Notes to organise uncertain placements.
• Recheck earlier candidates after entering a confirmed number.

Hard Difficulty

Hard difficulty asks for more patience and a more organised approach. The next move may not be obvious from a quick scan, so it helps to examine where a particular number could appear within each block and how those positions affect neighbouring areas.

Avoid entering a number simply because it looks plausible. Keep track of the remaining possibilities and look for a reason to eliminate each alternative. Hard puzzles are a satisfying choice for players who enjoy taking their time and gradually turning an uncertain board into a clear solution.

Expert Difficulty

Expert difficulty is intended for players who are comfortable with the rules and ready for a deeper challenge. Progress can require repeated passes through the grid, with each confirmed placement changing the possibilities in several other cells.

Careful note-taking helps you maintain an accurate picture of the puzzle. When you become stuck, change your focus: examine one number across the board, inspect a nearly completed block, or review a row with restricted candidates. This level rewards persistence and a willingness to reconsider the board from different angles.

Master Difficulty

Master difficulty provides a demanding option for experienced Sudoku players. It is best approached as a longer reasoning exercise, with accuracy taking priority over speed. Small details matter, and an unsupported assumption can make later decisions much harder.

Use the available tools thoughtfully, keep your candidates tidy, and pause to check the consequences of each move. If you need a hint, treat the revealed placement as an opportunity to review what changed around it. Master difficulty suits players who enjoy sustained concentration and the satisfaction of resolving a difficult grid.

Giant Mode

Giant mode expands the puzzle to a 16×16 board. The larger grid increases the number of cells, values, and relationships you need to track while preserving Sudoku’s central rule: each value must appear without repetition in its row, column, and designated block.

This mode offers a different sense of scale from a standard puzzle. Work through manageable sections rather than trying to study the entire board at once. Notes help organise the extra possibilities, while the zoom option makes individual areas easier to inspect. Giant mode is a good choice when you want a substantial puzzle to spend time exploring.

Daily Challenges

Daily Challenges give your Sudoku routine a calendar-based focus. Open the daily section, select a challenge, and work towards completing its puzzle. This offers an alternative to starting an ordinary new game and gives you a reason to return for another solving session.

The daily experience fits naturally alongside the game’s awards and statistics. You can enjoy completing the puzzle itself while also following your progress over time. Whether you play occasionally or make Sudoku part of your day, these challenges provide a clear goal for each visit.

Helpful Controls for Every Puzzle

The game’s solving tools let you choose how much assistance you want. You can record candidates, reverse a move, clear an entry, or request help when you cannot find a way forward. Fast Mode is an input option, separate from Fast difficulty, that lets you select a number and place it in multiple cells.

• Notes: Record possible values before committing to an answer.
• Undo: Reverse a previous move.
• Erase: Clear an editable entry.
• Hint: Get assistance with a difficult placement.
• Fast Mode: Keep a number selected while entering it into different cells.
• Statistics: Review your recorded results as you continue playing.