The game was a critical and commercial hit and has gone on to receive a bunch of different ports and cameos, as well as a sequel for Apple Arcade named ChuChu Rocket! Universe in 2019. Something you might not know about it, however, is that it also received a bunch of downloadable DLC following its original release, including new mission and character packs — some of which is still being discovered and archived today.
In the past, players have managed to archive two of these character packs (UFOs & Cows and Cartoony Look), as well as Sonic Team's official puzzle expansion pack featuring new levels, but earlier this week, an individual named @eisnerguy1 managed to come across another one of the game's missing DLC packs "on accident", which has since been archived.
The DLC pack was discovered on a Dreamcast Express Vol. 6 demo disc, which was one of a set of demo discs sent to Dreamcast owners who signed up for a partner service and includes 25 new puzzles, as well as a new set of characters who are modelled after the Dreamcast Express mascots Candy and Dandy.
If you're interested in downloading the files, you can grab them now from the Dreamcast Live website.