Board Thread:Questions and Answers/@comment-25018989-20151207205611/@comment-25523402-20151208000813

I believe the codes are only Japanese version only. Attempting to enter characters onto the English version's box will not work.

Basically the serial code thing is probably a just-in-case thing when PONOS ever releases official merch in the US or whatever.

So just slap them codes onto the Japanese version and see what cats you get.