We purchased both the iPhone and the iPad editions. I really hate the fact that the apps are not universal.
The iPhone app crashed on my iPad1. My iPad is on iOS5, but I've never even got to try the game. I even deleted and re-installed the application several times. Thinking that maybe it was the iPhone version, I bought the iPad edition and all it does is crash. Again, I cannot even get to the game. I have a NEW virtual door stop.