Blackmail! Dislike being blackmailed into downloading something else to unlock a level. Until that point, I'd been enjoying game. Uninstalled.

What a joke It's like a demo except if you pay 5/7 ign

Dishonest "580 levels"? Yes, if you purchase them. Otherwise, it's just 80.

Nothing remotely like Sudoku and not remotely created by the "same people". The game in this app is not a challenge, it's not particularly well made, it's ugly, it's full of ads, bugs, and pointless in-app purchases. I was suggested this based on That Level Again; this pile of crap is not on that level of quality by faaaaar. This app is more like a Kids First App project from a summer camp. This old as hell game can be found elsewhere in the app store, done much better, and doesn't cost a penny. This version of the game is a flat out ripoff machine.

This didn't feel very rewarding... The game is very fun, a bit difficult on some of the puzzles, but I refuse to pay for more levels. It doesn't feel rewarding. I'd much rather unlock the next set difficulty by playing, and then spend $ on a bonus pack, holding extra puzzles within the difficulty setting. THAT'S how you milk money on a basic puzzle game.

Fun and makes you think Update: Why does this game crash REPEATEDLY when I'm underground on the subway? Not the most exciting game in the world, but quite enjoyable and a time killer.