Sudoku
The classic number placement puzzle.
How to Play Sudoku
Master the controls, scoring formulas, and cognitive strategies to climb the leaderboard.
Core Objective
Fill the 9x9 grid with digits 1–9 so that every row, column, and 3x3 box contains all digits without repetition.
Step-by-Step Guide
Scan Rows & Boxes
Find rows, columns, or 3x3 blocks that already have the most given numbers (6-8 filled).
Use Elimination
Cross-reference intersecting rows and columns to find cells that can only contain 1 valid number.
Use Pencil Notes
Enable candidate notes to write potential candidates in tricky corner cells.
Complete the Puzzle
Solve all 81 squares with 0 mistakes to earn master brain badges and maximum XP.
Scoring & Points System
Cell Placed
Awarded per correct cell without errors.
Row / Box Complete
Bonus for finishing an entire section.
Zero Mistake Bonus
Awarded if completed with 0 errors.
Difficulty Multipliers
Pro Tips for High Scores
- Focus on numbers 1 through 9 sequentially across the whole board to spot naked singles.
- Avoid guessing! Every Sudoku has a logical deduction path.
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Skills Practised in Sudoku
Critical Thinking
Puzzles involve analyzing board constraints, cross-referencing clues, and eliminating impossible choices.
Deductive Reasoning
Players break multi-step logic grids and number arrangements into smaller verifiable steps.
Strategic Planning
Rounds encourage forward planning to avoid rule violations and deadlock states.