New game
Classic Sudoku structure plus Killer cages: outlined regions with a small sum clue—digits in each cage sum to that clue, with no repeats inside a cage. More in our basic rules guide. Select a cell, then use the number pad or keyboard. Turn on Notes to mark candidates; use Hint if you're stuck.
About Expert puzzles
The toughest level. Demands advanced techniques such as X-Wing, Swordfish, and Y-Wing. For puzzle enthusiasts who want a real challenge. Every puzzle has exactly one solution and is solvable by logic alone.
How we generate puzzles: We build cages from the unique solution grid and retry until Killer rules admit a single filling—then you solve from an empty start. Cage count scales with difficulty. Read more.
Who it's for: ProPuz is free, with no sign-up, for all ages. Whether you're a beginner or an expert, you can play on any device. About us · Techniques