I purchased this app assuming that it would be like the one I have on my PC, but I was sorely disappointed. For one, I cannot adjust colors for the left and right eyes such that I am able to see objects that should be visible to one eye and invisible to the other eye. The PC version is excellent in doing that and this app should have mimicked the PC version in doing so. Without the ability to make the proper color adjustments, I find this app useless and a pricey loss. Secondly, there is no reset button for the app game as offered in the PC version. This is an important feature when you do not have proper color adjustments and need to start over. Further, when you have to stop in the middle of a game and return later, you cannot start a new game until you have finished the previous one. Hence, you are forced to complete the game before you can begin a new one. I find that I am unable to use this app until these fixes are made. So, while I do highly recommend the PC version, I do not recommend purchasing this app for the iPhone until these features have been added and/or fixed. This was a costly disappointment.