Ultimate Sudoku

Ultimate Sudoku is the classic number puzzle from Famobi. The board is a 9x9 grid split into nine 3x3 boxes, with some of the numbers already filled in, and your job is to complete the rest.

Every row, every column and every 3x3 box must contain the numbers 1 to 9 exactly once. Select an empty cell and choose a number to place it. Use the note or pencil mode to jot down possible candidates in a cell when you are not sure yet, and remove them as you rule them out. Pick the difficulty that suits you: easy puzzles can be solved with simple scanning, while the hardest ones require advanced logic. Every Sudoku has exactly one solution, so you never need to guess.

Look for rows, columns and boxes that are nearly full - they are the easiest places to start. For another logic classic, try Minesweeper.

Play Ultimate Sudoku unblocked and free on Unblocked Games 88 - it runs in any modern browser with no plug-ins, sign-up or install. Go fullscreen with one click, save it to your favourites with the heart button so it is always one tap away, and share your tips or high score in the comments below.