Nonogram
Train Tracks
Shikaku
Pipes
Screw Puzzle
Arrow Exit
Block Puzzle
Drop Merge
2048
Sudoku
Fill the 9×9 grid so that every row, every column and every 3×3 box contains the digits 1 to 9 exactly once. Pick a level and start playing.
Plenty of givens and straightforward logic — perfect for beginners and a quick break.
Fewer givens. You will need notes and some scanning to make progress.
Very few givens. Expect to use advanced techniques and lots of notes.
PlayHow to play Sudoku →Free online Sudoku
Every puzzle on PuzzleWorld is generated by computer and checked to have exactly one solution, so you never need to guess. Choose easy, medium or hard and get an unlimited supply of new games.
Use notes to pencil in candidates, undo any move, and see mistakes highlighted right away. Your best score for each level is saved automatically in your browser (if you allow it).
The site works on phones, tablets and computers, and you can install it as an app to play offline.