Best Killer Sudoku app

The interface is clean, though can be a little cumbersome at times, hence 4/5 for this. This is easily the best app Ive found for Killer Sudoku that Ive encountered, though. Oh...and there are some rare Killer Sudoku puzzles with uncaged numbers that make for an AWESOME challenge! Ive never encountered them outside this app, but that could because I havent really looked for them. (Itd be nice to have an option that only generates those types of puzzles.)

I dont play regular Sudoku, so what follows is only with respect to the Killer Sudoku aspect.

On multiple solutions: some logical patterns do result in multiple solutions, but thats the nature of the patterns. There exists such a thing as logical "dont-cares" & they result in multiple solutions; its a valid pattern. Failing to see the pattern or that it allows multiple solutions to exist could explain why some people are complaining about unsolvable puzzles.

Crawford Comeaux about KillerSudoku