Frustrating interface – KenKen Classic Review

I am a long term sudoku player, and I thought I would expand to KENKEN with this app. The game (to fill all the spots of a matrix that satisfy certain rules with one and only one use of the digits in each row). KENKEN is challenging, however the human interface is frustrating. If you are not VERY purposeful about touching a location, it may or may not register the touch. This makes the game frustrating. I am a high speed sudoku player, so I know it is not my iPad.
Review by moo hoo on KenKen Classic.