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Much harder than the others. Start with miracle sudoku. But, it's incredible, and the puzzles are great.
★★★★☆Teddy Sudol· Mar 15, 2025
Great selection of puzzles, good UI, good configuration options. Overall very fun! I'm taking away one star because the pre-written hints are frequently wrong and/or confusing. Hint #1 of Puzzle #22 "45s" is a great example: the third part (about where 8 goes in r1) directly conflicts with the previous part of the hint, and the final part is downright impossible. Of course, this isn't a problem if you never need hints, but some of us do!
★★★★★Timothy Baize· May 19, 2021
The puzzles are going to be hard. You aren't going to be able to immediately put digits into the grid. I will let you in on a few secrets 1-9 added up equals 45, and you should know about the fistful ring. All of these are things I learned from cracking the cryptic YouTube channel. Just because this is CtC I know for a fact these puzzles have unique solutions and logical solution paths, no bifurcation necessary. Be patient with the puzzles and don't worry about time.
★★★★★sampath kumar· May 24, 2021
A thoroughly enjoyable puzzle that will be enjoyed by anyone that likes math based puzzles. Very user-friendly software to edit, color, undo the grid. Like all the apps from the cracking the cryptic group this too is fantastic.
★☆☆☆☆Shelley and Gray Strickland· Mar 13, 2022
I love the added features that this game has that no others have, such as the built-in sum calculator. However, the fact that the game places notes in non-traditional locations, unlike every other Sudoku game in the world, is just irritating.
★★☆☆☆Jeroen van den Broek· Mar 29, 2021
Even the supposedly easiest puzzles are way harder than the easiest puzzles in the other CTC apps and in this app the hints are even worse than in the other apps. If you get stuck, forget looking at the hints to help you out. Half the time they mention a wrong row or column number and most of the time there are steps in the logic that aren't easy to see that are completely skipped in the hints. All the other apps are nice, but I can't recommend this one for anyone who's new to killer sudoku.
★★☆☆☆Leah Oliver· Oct 27, 2021
The games are challenging, but my progress has not been saved the last two times I worked on a puzzle. Really annoying to have to solve over and over again to get back to where you left off.
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