But if you want a little more challenge, you can play the famous Japanese game Killer Sudoku on your Windows PC. This Sudoku version offers more challenge, with the same classic look. So what’s new with this game?
It presents empty grids where you have to figure out which number goes where. No numbers. No hints. You have to find all 81 numbers. You only have to rely on a few clues (the sum of cells grouped by the dotted lines). You can check the validity of your answers in just a click.
Killer Sudoku contains 30 puzzles with 4 difficulty levels. And best of all, it’s absolutely for free.