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Only these are passwords:
スキアブレードⅠ：2006 0831
スティールハーツⅠ：2011 0224
The rest is a post date from 2ch.

I have a feeling if we start trying out more Phantasy Star related dates we'll find other password items considering those are Infinity's upcoming release date and PSU's JP release date.

Agreed, but something would have been better than nothing, which is what they have going on now, nothing.

A bad choice on their part, they shouldn't give up this easily since not everyone even knows the codes were released, it'd still bring more advertisement to the game, but I guess that's too hard to...