I have found that if you find the battlefield keys out of sequence then you can only seem to go to level one even if you have found all the keys. It also doesn't help if you first hit level 2, then level 1 and then go back to the level 2 (or 3 or whatever) key, you will always only be in level one, even though the message when you go to the battlefields tells you you are going to what ever the highest level key you found. because of this, I only use the battlefields as a spot to buy or sell items or if I need a rest.
