nop90 works on a port of the unofficial fan game Zelda: Oni Link Begins.

Brought down by a terrible curse since his recent victory on the Dark Lord, Link is changing, day by day, into a powerful creature with a destructive nature named Oni-Link. Bannished from Hyrule, the young Hylian asks the princess Zelda some help. She shows him his last hope: a portal to a secret world.

Changes:

– Activated sounds
– Added Spanish and French languages (some menu not completed yet)
– Mapped missing keys

http://gbatemp.net/threads/release-zelda-olb-for-3ds.429986/