Classic Sudoku

About Classic Sudoku: The World's Most Popular Logic Puzzle

Classic Sudoku brings the world's most popular logic puzzle to your browser, challenging you to fill a 9×9 grid through pure deductive reasoning. It's more than numbers arranged in a grid — it's a mental workout designed to help you relax and sharpen concentration at the same time. Several views of the game show the 9×9 grid composed of nine 3×3 subgrids, each cell waiting to be filled with the right digit.

How to Play Classic Sudoku

Game Objective

The goal is to fill every cell in the 9×9 grid with digits so that three conditions are all met simultaneously:

• Each row contains no repeating digits.
• Each column contains no repeating digits.
• Each 3×3 subgrid contains no repeating digits.

Gameplay Features

• To clear a cell, select it and press the ERASE button.
• Press UNDO to revert your last move.
• If you get stuck, press the HINT button.

Victory Conditions

The puzzle is solved when the entire grid is filled correctly — no mistakes and no empty cells remaining. Points are awarded based on the selected difficulty and the time taken to finish, and your total score is saved and submitted to the leaderboard.

Controls

• Keyboard (number keys): Enter digits into the selected cell
• Arrow keys: Move around the grid
• Touch (smartphones): Responsive touch controls with large, easy-to-use buttons

Games You Might Like

If brain-training puzzle games keep you coming back, the full puzzle games collection on Playgama is a great place to explore, and the dedicated Sudoku games section has more grid-based logic challenges waiting for you. For another satisfying logic experience built around clear rules and step-by-step grid clearing, Arrow Puzzle rewards careful thinking with every tap. Fans of tile-matching logic will find Mahjong Lines equally engaging, connecting pairs across a single-level board using no more than three straight lines. If you enjoy a clean, distraction-free board game with hint support, Spider Solitaire for Seniors offers a comfortable card-game challenge across multiple difficulty levels. FreeCell - Classic Solitaire rounds out the selection with undo moves, move tracking, and a smooth modern feel that classic card-game fans will appreciate.