In this example, the number 5 forms the necessary pattern to apply the X-Wing strategy. The next step will be to test those sets on the grid and eliminate the digit from any cell that would become impossible in both situations. By making an X linking diagonally the two opposite extremities of this rectangle, the player finds only two possible sets of positions for that digit. The player can use this strategy when there is one candidate repeated in four cells that form a square or rectangle when mentally connected by row and column. It can also be applied in some intermediate levels, although its incidence is very low in these cases. The X-Wing method is one of the most basic advanced Sudoku strategies. Regardless, their application always demands high levels of concentration from the player as they work by deduction. Well worth exploring.Advanced Sudoku strategies are used in the hardest levels of these puzzles and they can either help to reduce candidates or to find the solution for a specific cell. I’ve tried some of the other games from this developer and while not all of them are my cup of tea I have really taken to a couple of them. You can even clear completed puzzles and do them again, which is great for helping you to improve. A bargain, and they’ll last me for years even if I do 3 or 4 a day (which I do). I got over 1600 puzzles over the whole range of difficulty for under a fiver, and that gets rid of the ads too. Not many free ones but the bundles are pretty cheap to buy so it’s not a problem. There is a really good gradation of difficulty so you can choose the level you want and gradually work up to the harder ones. Or you can decide to be lazy about that and let the app do it. You can choose to make it exactly like playing on paper, ie the pencil marks don’t automatically disappear from row column and square when you put in an answer. Lots of helpful extra features, some of which I’ve found nowhere else. No fiddling about between pencil on and pencil off. All of then had issues of one sort or another. I’ve tried many killer sudoku apps over the years. 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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