This zip contains mp3 transcodes of the only 2 songs of the hidden game within Pokemon Puzzle Challenge or Pokemon de Panepon if you're playing the Japanese version. I ripped the songs into WAVs and converted them using VBA-M. I decided to do this as no one else has yet and this secret game was only recently discovered.

Link: http://www.mediafire.com/download/u8uck7m8iz7ju23/Panel_de_Pon_GB_Beta_BGM.zip

Info: https://tcrf.net/Pok%C3%A9mon_Puzzle_Challenge#Panel_de_Pon_GB