Thread:KeyOfDestinyRoxasXIII/@comment-22439-20130919011426/@comment-9531161-20130919193325

It's not as easy as "this is how you do it". I have no idea how much you know; I may need to explain half of Petit Computer before I'd be able to explain it. That's why I'm pointing you to other games... in that case, you can ask specific questions instead of extremely broad ones. I'm sorry.

Here's one that's quite a lot simpler: http://www.nintendolife.com/forums/dsiware/petite_computer_qr_code_sharing_thread?start=820#reply-823

Here's another one that's quite complex, but it's a complete game (unlike the engine):

http://incrediblystrangegames.com/post/39911250845/wanderer-for-petit-computer-on-3ds