Sudoku - Pin.Games

The moment it gets tough is around difficulty four or five, when the easy rows dry up and you're stuck squinting at a 3x3 block with three empty cells and no obvious move. That's where Sudoku - Pin.Games earns its keep. Flip on Notes mode to pencil in candidates, chip away at the logic, and when a hint saves you from one dumb mistake, the grid finally clicks into place.

Six difficulty levels mean you can start light and work up, or jump straight to the version that actually fights back. Combo scoring rewards you for stringing correct placements together, and five handcrafted visual themes keep the grid from feeling like the same puzzle every time. Daily challenges give you a reason to come back and test yourself against a fresh board.

It runs straight in your browser on desktop, free, no download. If you want something to unwind with between rounds of number logic, Mahjong Connect scratches a similar quiet, focused itch. And if Sudoku's your speed, the wider Puzzle games shelf has plenty more logic to chew on.

Fill the 9x9 grid so every row, column, and 3x3 block contains the digits 1 through 9 exactly once.

Tap a cell to select it, then tap a number to fill it in. Switch on Notes mode when you want to pencil in candidate numbers instead of committing right away, and use your hint if you're stuck to reveal the next logical step.

Work the easy rows and blocks first, then use notes to narrow down the harder cells - it's faster than guessing and starting over.