Here’s a write-up about Sega Naomi ROMs exclusives — titles that were either only released on the Naomi arcade hardware (and never ported to Dreamcast or other home consoles) or are considered exclusive to the Naomi ecosystem in a meaningful preservation sense.
Sammy Atomiswave: A cost-reduced version of NAOMI hardware that used traditional cartridges instead of GD-ROMs. Sega Naomi - The Centre for Computing History sega naomi roms exclusive
The Legality of Sega Naomi ROMs
The Sega NAOMI (New Arcade Operation Machine Idea) hardware hosted a vast library of games, many of which remain exclusive to the platform or have only specific arcade versions that differ from their home console counterparts. Sega NAOMI Exclusive Titles Here’s a write-up about Sega Naomi ROMs exclusives