Killer Sudoku‪!‬ 4+

This is an update to my earlier review. In my experience this is he best killer sudoku app for iOS. Is still love it if the app would generate puzzles, but other than that it’s ideal.

The double keyboard and drag-select make entry very quick. I'd like it better if it would generate puzzles. They've added color-coding the groups since my last review, and that helps a lot --thanks!

The support is very good as well. An earlier update broke the "9" button on the iPad. I sent an error report by email, and within a day (over a weekend!) I received a very polite response and the information that the fix for the problem had already been submitted to Apple. This is a top-notch product and I don't hesitate to recommend it to anyone looking for a good implementation of killer sudoku puzzles. The update was available soon after, and fixed the problem.

I’m pretty sure I’ve played all the apps for killer sudoku and this is BY FAR the best. Why?

1. Dual keypads so no tedious switching or mistaken entries
2. Quick combo lists in floating panel with strike through
3. Quick sum any region, e.g. rule of 45xN
4. Notes are by ENTRY order, not fixed, so you can capture more information, like must-have or subsets

This lets you focus on the logic and strategy of solving the puzzle. You don’t have to use them if you want to do more mental math.

I only use 5 rules to solve any puzzle, and this app interface makes using them elegant:
1. sudoku rules (1 digit per zone)
2. naked tuplets
3. killer rules (region sum and 1 digit per)
4. rule of 45xN
5. blocking sets (mutually exclusive combos)

Other niceties: NO ADS, rainbow fields to see easier, mini calculator, undo/redo, unlimited in progress puzzles, auto note updates, error checking, and more

Only missing feature I would like is ability to highlight digit type across puzzle, including notes, to see patterns easier. Probably tricky with the variable notes which I would not trade.

Two slight “bugs”: strike through misaligned on lists; region sum label is small, blurry (scaled font?) and hard to read sometimes

I’ve been playing killer sudoku for years and this is by far the best app I’ve seen for it. The only suggestions I have are:
1) to have a setting that allows for multiple uses of a single number in the notes. I realize this could be tricky from a programming standpoint and could make note-taking too complicated.
2) allow for spaces in the notes to separate what you know has to go in a group of cells from what could go there.
3) have a feature where if you hold down the number with no cells selected, it highlights the cells that contain that number as an entry or as a note, so you can quickly see where the sudoku rules force certain entries or elimination of certain notes.