Ultimate Sudoku - Play Online for Free! | Poki Game

Ultimate Sudoku is a straightforward take on the classic number puzzle: fill the 9x9 grid so every row, column and 3x3 block contains the digits 1 through 9 exactly once. There's no timer pressure forcing your hand — it's pure deduction, working out which numbers are already ruled out for a cell until only one answer fits.

You pick a difficulty before you start, and that choice changes the whole feel of the puzzle. Beginner grids give you enough filled-in numbers that most cells fall out from simple scanning; advanced grids leave you chaining deductions across the whole board before a single new digit clicks into place.

Controls

• Click or tap a cell, then click or tap the number you want to place

Tips

• Scan for rows, columns or blocks that are nearly full first — they narrow down candidates fastest.
• If a cell has only one number that doesn't already appear in its row, column and block, place it immediately before moving on.
• Start on beginner if you're new to sudoku logic; the harder levels assume you're already comfortable spotting these patterns quickly.

Good for a slower, focus-driven session rather than a quick reflex game — pick a difficulty that matches how much time you actually want to spend on one grid.