Sudoku
Calm • Focus-friendlyChoose a difficulty, or take on today’s daily puzzle. Smooth controls, notes, highlights, timer + PB, and local saves.
Choose a difficulty
Pick based on your mood — quick warm-up, steady flow, or a deeper session.
Easy
Gentle pace, great for relaxing.
Medium
RecommendedBalanced and satisfying.
Hard
More constraint, more deduction.
Master
Slow, careful, and rewarding.
Play Sudoku Online on Gridcore
Gridcore Sudoku is built for focus: clean visuals, smooth controls, and a calm solving experience. Play instantly in your browser with multiple difficulty levels, a daily puzzle, notes mode, a timer, personal best tracking, and local saves.
How to Play Sudoku
New to Sudoku? Read our beginner guide on how to play Sudoku for a step-by-step explanation and basic strategies.
Sudoku is a 9×9 number puzzle. Your goal is to fill the grid so that each row, each column, and each 3×3 box contains the numbers 1 through 9 exactly once.
- Each row must include 1–9 with no repeats.
- Each column must include 1–9 with no repeats.
- Each 3×3 box must include 1–9 with no repeats.
- Use the given numbers as clues and deduce the rest step by step.
Frequently Asked Questions
Can I play Sudoku for free?
Yes. Gridcore allows you to play Sudoku online for free with no account required.
How do you play Sudoku?
Fill each row, column, and 3×3 box with numbers 1–9 without repeating any number.
Is Sudoku good for your brain?
Sudoku encourages logical thinking, pattern recognition, and focus.
What is the hardest Sudoku difficulty?
Master level is the most challenging on Gridcore.
Go back to Gridcore home, or try today’s Daily Sudoku.