Sonic N is a port of Sonic Advance which can be difficult to play due to the N-Gage's vertically-oriented screen.
A leftover graphic from a demo version of the game.
Music Player Text
Present at 0x14BEA0 in sonicn.app is some text for a music player.
Play: ILLID: SONG NOT FOUND: bin snd CONN SIZE READ LOAD PCM NOT FOUND TYPE R? TYPE UNKNOWN ? %d smp buf? BC Underflow BC Abort BC Error Play Underflow Play error I9 X9 SAssert
Sonic Advance Leftovers
Present at 0x14CFA8 and 0x14D158 in sonicn.app is the ROM header from Sonic Advance.
The game's title is present at 0x14E118 in sonicn.app:
And some text related to the Game Boy Advance Link Cable is present at 0x14E128 in sonicn.app:
MultiSio@4 32Load 010528