Some Games or Demos are missing in the Online Rarity Guide.

USA Demo:
Super Mario 64 DS DEMO (USA) - DIS-NTR-A23E-USA

Europe Demos:
Metroid Prime Hunters - First Hunt (Europe Multi 5) - Cart & Manual: NTR-AMFP-EUR Box: NTR-AMFP-EU6
Project Rub DEMO (Europe Multi 6) - DIS-NTR-A26P-EUR
Wario Ware Touched! (Europe Multi 5) - NTR-A22P-EUR

And I know there exist a Yoshi Touch & Go DEMO (Europe). But this have I see only Instore yet. So can't tell a number here.

And a normal Europe Game which is already out (maybe some more):
Another Code - Two Memories - Cart: NTR-ANOP-EUR Box & Manual: NTR-ANOP-FHUG

When someones else know missing Nintendo DS games or demos, then just add them here.