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Sudoku Killer app review: get ready for Sudoku challenges 2021



If you think you're a pro when it comes to Sudoku challenges then we've got some real tough puzzles for you in this sudoku app.

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The Sudoku Killer app for your iPhone, iPod touch, and iPad provides players with some rather tough puzzles to solve.

This isn't your classic or ordinary version of Sudoku where you’ll be following all the normal rules; there are a few other twists built into this challenging sudoku app.

Because this is a rather challenging version of the app; you'll want to keep notes and with that in mind, the app has a built-in note-taking tool.

Keep reading our Sudoku Killer app review to learn more about this good sudoku app for iPhone.

Killer Sudoku!


An Alternative to Paper Puzzles

Perhaps you're quite stuck on classic Sudoku puzzles that you play on paper and really don't feel an app would give you the same experience.

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The Sudoku Killer app is one that may just prompt you to make the switch. The user interface has been made to feel like you are doing the puzzle on paper and you can even take notes; in fact you're encouraged to take notes, right in the app.

You're given a note keypad and you can also choose more than one square at a time for fast and smooth notes. Your notes will be close as hand at they float right above the actual puzzle.

The app is free to use but you are only given 10 free puzzles. There are up to 800 available through in-app purchases of puzzle packs. Each pack is priced between $0.99 to $4.99. 

An Alternative to Paper Puzzles image

Gaming Features

The Sudoku Killer app is filled with all kinds of features that make it a fun option for players. The app features autosave so you never have to worry about losing your progress. 

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The progress gallery makes it possible to view all the puzzles you are currently working on to see how far you are in each, and the quick combination list button can really help save you time.

Additional features include the redo and undo buttons, the mini-calculator, the quick sum button, and a mistake highlighting feature. You can customize the experience by picking your color scheme you can go with the rainbow brights or the classic newspaper theme.

The app itself is constantly being tweaked behind the scenes to ensure stabilization and optimization. 

Gaming Features image

Killer Sudoku!


Pros and Cons


  • Provides players with an experience that compares to the classic pen and paper version
  • Choose your color scheme
  • There are a huge variety of game features, some of which are unique to the game
  • You can take notes with the note-taking tool
  • The app uses autosave so you don’t lose your progress


  • You are only given 10 puzzles for free which you’ll complete in no time

Pros and Cons image

Final Thoughts

The Sudoku Killer app for your iPad, iPod touch, and iPhone is able to keep you busy for hours with some rather challenging puzzles and unique gaming features.

Killer Sudoku!

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