Educational Benefits

• 1Exercises pure logical reasoning
• 2Improves concentration and sustained focus
• 3Develops systematic and deductive thinking
• 4Keeps the brain active and stimulated

How to Play

The goal is to fill a 9×9 grid with numbers 1 to 9 so that each row, each column, and each of the nine 3×3 boxes contains all digits from 1 to 9, without repetition. Tap a cell to select it, then tap the desired number on the bottom panel. Pre-filled (given) cells cannot be changed. Wrong numbers appear in red and cost a life. You start with 3 lives — lose them all and the game ends. Use the 💡 Hint button to reveal the answer for a cell (costs 100 points). The ✕ Erase button clears the selected cell. The ✅ Verify button highlights all incorrect numbers on the board. The ✏️ Notes mode lets you mark possibilities in pencil without committing to the grid.

Tips & Strategy

1. 1Always start with the blocks or rows that already have the most numbers filled in — they constrain possibilities the most.
2. 2Use Notes mode (✏️) to mark candidates in difficult cells before committing to a number.
3. 3Check rows, columns, and blocks simultaneously for each digit 1–9 — crossing these three constraints reveals many solutions.
4. 4Save Hints for moments of total blockage, not right from the start — each hint costs 100 points in your final score.
5. 5Completing the puzzle without errors on Hard in under 10 minutes guarantees a maximum score.

Frequently Asked Questions