![]() ![]() ![]() 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. And still, I love how many puzzles there are, still with no ads for my original purchase.Play our free puzzles online or try them out on your iPhone or iPad! You can now cross off impossible combos in the lists, and the ease of summing multiple boxes is a really great add. Update-5 years later, this is still my go-to puzzle app. Tons of puzzles for the money, no annoying ads or requests for in-app purchases.excellent buy. I would also like to organize the combinations I pencil into the puzzle squares (for example, show that the 3 box combo summing 22 HAS to have a 9, but then 5-8 or 6-7 are the possible remaining options.) I would love the option to cross off impossible combinations in the lists. Occasionally I will lose recent changes in a crash like that. It does crash on occasion when I select the combination/list icon when it does crash like that the only way to get back to the puzzle is "new puzzle -> in progress" (the resume button won't work). I love Killer Sudoku and this app is designed so well I almost do prefer it to working a paper puzzle. There are also more than three thousand puzzles available to purchase, but the ten free puzzles might just keep you busy for a long time :)Īll our killer sudoku puzzles have a unique solution. It comes with ten free killer sudoku puzzles-two puzzles in each of the five levels. We made this app free so that you can test it without having to buy anything. ![]() Comes with 10 free puzzles for testing, and over 3,000 puzzles available for purchase Puzzle gallery - scroll through puzzles and see your progress instantly Two color schemes - a neutral newspaper color scheme and a rainbow color scheme Auto note option - automatically remove trivially eliminated notes when you enter an answer Mistake highlighting option - don't let mistyped entries from set you back Undo & redo buttons - step back through your changes to fix a mistake Built-in mini calculator - do even long sums easily Quick combination list button - list all combinations fast by dragging over the desired region Quick sum button - add all selected sum labels instantly Handy combination lists - can be rearranged on the screen for easy comparison Multi-square note entry - a huge timesaver Dual keypads - no tedious toggling between note and answer mode Our interface is so good, you may prefer it to doing puzzles on paper. You can even make combination lists that float above the puzzle and can be rearranged on the screen! Cross out combinations from your lists as you rule them out. A dedicated note keypad and the ability to select multiple squares makes entering notes fast. Solving a killer sudoku puzzle requires a lot of notes, so we worked hard to make the note entry features in this app perfect. The grid begins blank, but these rules give you all the information you need to solve the puzzle! To complete a puzzle you must fill the board with numbers that obey traditional sudoku rules AND make each outlined region sum to a specific value. Killer sudoku is a popular variation on classic sudoku puzzles. ![]()
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