ChuChu Rocket! - Dreamcast Express puzzles (JP)
By DLCarchive Public Version 1
Puzzle collection from Dreamcast Express volume 6: 25 puzzles in a 75-block bundle. Japanese puzzle names; archive labels this the JP version. Source: Dreamcast Live / Dreamcast-Talk archive. https://dreamcastlive.net/chuchu-rocket-dlc/ Shares a VMU filename with other variants; install one per VMU. Not game-tested.
CHU_CHU__D00 75 blocks
Raw VMU save data blocks. Use the Dreamcast app to download on a real console.