#Free online sudoku difficult free#

The gods understand English, but will answer all questions in their own language, in which the words for yes and no are da and ja, in some order. Your task is to determine the identities of A, B, and C by asking three yes-no questions each question must be put to exactly one god. True always speaks truly, False always speaks falsely, but whether Random speaks truly or falsely is a completely random matter. The Hardest Logic Puzzle Ever Three gods A, B, and C are called, in no particular order, True, False, and Random. More information on how Inkala's puzzles are rated is on his website.

In 2012, Finnish mathematician Arto Inkala claimed to have created the 'World's Hardest Sudoku'.Īccording to the British newspaper The Telegraph, on the difficulty scale by which most Sudoku grids are graded, with one star signifying the simplest and five stars the hardest, the above puzzle would 'score an eleven'. Sudoku is easily the most played and most analyzed puzzle in the world, so coming up with the hardest one is no mean feat. All of them, however, are promised to test your solving skills to the absolute limit and keep you busy for hours, if not days.įind an even harder puzzle? Be sure to let me know! For more information about this project and other logic puzzles visit my website 1.

Some of these puzzles can be solved right on this page while others can be downloaded or reached elsewhere. In the following list you will find both familiar puzzles and games such as Sudoku and Calcudoku as well as lesser known ones such as the Bongard Problem and Fill-a-Pix. Every once in a while I added a new type of puzzle, until I ended up with a list of 10.

After having created number puzzles like Calcudoku and Killer Sudoku for many years, I decided to try and find the most challenging ones out there. So you think you are clever, right? Then here is your chance to pit your brain against some of the world's hardest logic puzzles ever created.

#Free online sudoku difficult free#

Play our free puzzles online or try them out on your iPhone or iPad!