It does not work. Everything is off center, and does not function. If you download it, you will just have to delete it.
But thats what you should do. That way, if they ever fix this game, you will have a functioning copy.
I am using an iPad 2, and, as I said, nothing works here. As it is, it is just a waste of space.
If you need a working boxing game, try Super K.O. Boxing 2. It tries to IAP you to death, but at least is works...
I eat flies about Iron Fist Boxing, v3.9.4