For those assembling the package, remember the golden rule: Base > Update > DLC. Install them in that order, use a reliable installer, and always patch your firmware to the latest version. Play responsibly, support the developers if you can, and enjoy one of the most hauntingly beautiful dungeon crawlers on the Nintendo Switch.
For fans of dungeon crawlers looking to dive into Mary Skelter 2 Mary Skelter 2 ROM NSP UPDATE DLC - Switch Game
If you must use a ROM, ensure you only download from verified scene release groups (like SUXXORS or Venom) and cross-check the CRC/SHA hash against No-Intro databases. Never run unknown .NSP files without scanning them first. For those assembling the package, remember the golden