Enjoy the free Killer Sudoku puzzle games for both beginners and advanced Sudoku lovers! Download and start the daily challenge for free! Thousands of killer sudoku puzzles here for you to solve. Come to play this new killer sudoku game, and train your brain. Have fun! [New] Dark Theme. Perfect to play before bad! [New] Color Theme. Playing games could be colorful! [New] Casual Mode. 4*4 and 6*6 boards bring you more fun! Killer Sudoku Free is a logical puzzle number game & brain game. To complete a puzzle, like the classic sudoku game, you can fill the grid with numbers; unlike the classic sudoku puzzle, you have to make sure that the sum of numbers in each cage (areas surrounded by the dotted lines) is equal to the number in the upper left corner of the cage. If you are interested in playing number games or math puzzle games, this Killer Sudoku is exactly for you! If you'd ever played number games, such as Sumdoku, Sumoku, Addoku or Cross sum...