🔢 Sudoku Challenge

Sudoku Challenge is a clean, classic number puzzle that tests logic—not math. Fill the 9×9 grid so that every row, column, and 3×3 box contains the digits 1–9 exactly once.

🎯 Objective

Complete the grid using deductive reasoning until all cells are filled with valid digits.

Rules & Gameplay

• Each puzzle starts with fixed givens you cannot change.
• No number may repeat within any row, column, or 3×3 box.
• Work from certain moves to uncertain: place singles first, then explore candidates (pencil notes if available).

Strategy Tips

• Scan rows, columns, and boxes for missing digits; place naked singles immediately.
• Find hidden singles: a digit that can only go in one cell of a unit.
• Use pairs and box/line interactions to eliminate candidates.
• Stay tidy: keep notes consistent and avoid guessing whenever possible.

Why Play Sudoku Challenge

Quick to learn, endlessly replayable, and perfect for sharpening focus. Enjoy a pure logic workout in your browser.

Background & Origins

Modern Sudoku evolved from Latin squares and became globally popular after Japanese publishers popularized the 9×9 format. Simple rules plus deep logic have made it a timeless favorite online and on paper.