Yeah, I know hard makes the chests better, it's just that it's not really worth having to use 6 life bottles to get through a regular encounter. I'll probably have to do it anyway later for farming the ultimate spheres, but yeah.
As for grade, I'm pretty much in the clear already. I checked a floor or two ago and I could already afford pretty much everything I wanted, by now I should be well beyond what I need.
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Falcon Punch
http://www.youtube.com/watch?v=FFtw7qW7Vcw