5 stars: I play this on my tablet (2 in 1 laptop). It is a great interface, giving you all kinds of options making a pen and paper obsolete. I used play sumdoku on paper, but this is so much easier. Probably the best constucted puzzle app I have played. If you like sumdoku, you have to play this one.....you won't be sorry.
5 stars: Gear interface, I've experienced no problems or obtrusive advertisements. I recommend this without reservation if you enjoy puzzles.
5 stars: I love killer sudoku and this game gives you lots of free ones initially plus a weekly bonus game. Once they run out, you are able to purchase extra games.
5 stars: Great intuitive design. Reasonable prices for additional games. No annoying ads. I enjoy all the conceptis games I've downloaded
5 stars: If you like Killer Sodoku then you'll love this app. A choice of varying levels of difficulty with some helpful tools. Great job.
5 stars: Sudoku on steroids. I don't see myself ever playing Sudoku as long as I still levels in this game. It adds so many levels of thinking to a classic.
5 stars: Excellent game! Easy to get carried away with sum sudoku. Great exercise for the brain! Great challenge!
5 stars: I love this game. But in possible sum combination, i miss manual shadowing choosed combination. When I'm sure that some combinations are impossible, I'd like to shadow them.
5 stars: Really like this ad free version. The same principle as killer s. A few little changes , like my...