Nickelodeon Magazine had a small bit on Sonic Rush Adventure for the Nintendo DS. This says:
A High Seas Adventure Rated ARRRRRRH! *For intense piracy
Find 16 Hidden Islands filled with secret treasures!
The DS screens that are in the middle say: Battle Captain Whisker and other mega bosses!
The DS screens farthest away from Sonic say: Get vertical while pulling off tons of moves and tricks!
Then, the paragraph right above the Sonic Rush Adventure logo says: Race island-to-island as Sonic or Blaze on a wild and dizzying hunt for lost treasure! Dive into deep sea caves, outrun an avalanche and battle with pirates as you blast through 14 action-packed levels with 100 unlockable missions!