psychologyThink Game

SUDOKU

Fill every row, column & box with 1–9

Difficulty Easy
Conflicts 0
Remaining —
SUDOKU
Choose difficulty
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Expert Tips
Scan rows and columns: For each empty cell, eliminate which digits already appear in its row, column and box — the remaining candidates narrow fast.
Singles first: Look for cells or boxes where only one digit is possible — these are free fills and often unlock more.
Work the boxes: If a digit can only go in one row or column within a box, you can eliminate it from the rest of that row or column across other boxes.
psychology Logical Deduction
grid_view Pattern Recognition
memory Working Memory

Sudoku

Goal

Fill the 9×9 grid so that every row, every column, and every 3×3 box contains each digit from 1 to 9 exactly once.

Difficulty

  • Easy — many given digits, solvable with basic scanning.
  • Medium — fewer givens, requires elimination techniques.
  • Hard — minimal givens, demands deeper logical chains.

Scoring

Your score is based on difficulty (Hard = 2000 base, Medium = 1000, Easy = 500), minus 30 points per conflict you create. Solve without any rule violations for a perfect score.

Why this sharpens your mind

Logical Reasoning

Sudoku requires systematic elimination and deduction — the same cognitive muscles used in analytical problem-solving and structured thinking.

Working Memory

Holding multiple candidate values in mind across rows, columns and boxes stretches your working memory capacity and improves concentration.