Sudoku

Free online sudoku

Super Sudoku is a free sudoku game that runs in your browser on a phone, tablet or computer. There is nothing to install and no account to create. Your current puzzle, your times and your settings are saved on your own device, so you can close the tab and pick the game up later.

There are seven levels: Easy, Medium, Hard, Expert, Master, Extreme and Insane. A level is defined by the solving technique a puzzle needs, not only by how many numbers are given, so a harder level can call for stronger logic. Every puzzle has exactly one solution and can be finished without guessing.

Use pencil notes to track candidates, fill all notes with one tap, colour cells to follow a chain, and ask for a hint when you are stuck. A hint marks the pattern on the board and explains the step, so you learn the technique instead of only getting the answer.