I remember making a “map” of sudoku puzzles just like the layout of this app where the immediate possibilities are shown for the the yet unknown positions probably 15 years ago when I had time to kill and absolutely HAD to solve the sudoku in the paper! And it doesn’t seem to appear in other apps! The input is simple but powerful in that you can put in a series of numbers and it reads it like a charm! I made a mistake in my first input and how the program reformats the raw number input is beautiful in its simplicity without needing to go in and out of input boxes and how it can reformat it into a very readable layout is fabulous! I haven’t tried out turning off analysis mode features mentioned in the other review, but turning off where it makes the correct answer red makes it maybe a bit too easy. I do like where it highlights the boxes in yellow though. I’m a programmer myself and I appreciate good engineering and this is pretty fabulous!

I’ve been enjoying sudoku on my iPhone for several years now and never seem to tire of playing. I downloaded Sudoktor after finding a puzzle in a magazine I wanted to tackle, because my original app does not allow me to enter a puzzle myself. This app is very powerful, but still allows you to control just how much help you want. You can “go it alone” or ask for guidance. This has encouraged me to learn more about the complex logic behind eliminating incorrect candidates. It’s like discovering a whole new game.

Unusable. Can’t tell if it is good or bad. Could not get that far. Locks up 100% of the time after just a few button pushes on latest iOS devices. Tried it on two iPads, Mini and Gen-3 12.9 inch. Same thing.

Should have read the reviews. Do not purchase, there is no way to get a refund.