3Doku

Started out good with a nice challenge aspect, but got tedious really fast. It wasn't challenging anymore when you knew which numbers went where, but had to do it 100 times to fill everything in.

The puzzles are nearly impossible to solve at hard and above without enabling all options. However, manually removed hints cannot be undone, which means you can make a mistake and never get back to a valid puzzle using the undo button. Also, the auto fill function rarely fills all the cells left with only one hint, which can be annoying. Nobody would want to try to fill in several hundred numbers by hand. This should be fixed. Finally, the cube graphic showing initial, solved, and current cells will never update on iPad 3 with iOS 5 until you rotate the screen orientation. However, if you have plenty of time, these hard puzzles take some work to solve, and the Monster puzzles are nearly impossible without advanced solving techniques like fish and inference chains. Once the above problems are fixed, I will re-rate this as five stars.