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Well, they are somewhat not random in a way, for example puyo fists uses two recurring sets 112x and 33x8,

Puyo Fist code is 1129 3398, if you notice, coincidently both their X=9,

not all of...

Been working on cracking these codes for a little bit, I'm starting to notice a patern in the way you type them, but it may just be me, anyway if anyone else is working on cracking the codes, so far...