Maybe you've already talked about this, I don't know it's my first post, but I read something interesting in a Walkthrough/FAQ. Someone wondered why you can't use the 3 unknown items untill the end of the game. It's a reference to Kid Icarus. In Kid Icarus you have to collect 3 items and you can only use them at the end of the game. The Items are: Lightarrows, which can go through multiple enemies(Plasmabeam), Pegasuswings, enables unlimited flight(Space Jump) and Mirror Shield, extra protection(Gravitysuit). I think it's pretty neat.
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