The resident evil 3ds game has that issue. Somewhere towards the begining of the game it one time briefly mentioned that you can do some sort of dodge or deflect move that you can go the entire game and never once really need it till you get to the end boss and if you can't do that move the ending becomes considerably more bothersome. After realizing that I was going to need to be able to do that move if I wanted to complete the game and not yank all my hair out I went looking first in the manual and found every other move and touch control detailed but not the one I needed. and the only in game mention was that it was a touch control but not what sort of motion I needed to make .