: Instead of playing a standard Dreamcast ROM, the ultimate way to experience the game is by getting the standard PC version of Sonic Adventure DX and using community mod loaders.
One of the coolest rabbit holes in the Sonic Adventure ROM and ISO community is the preservation of its lost Dreamcast DLC. Sonic Adventure was a pioneer in console DLC.
: For a completely fresh mechanical take, the Sonic Adventure Archipelago hack turns the game into a progression-locked Metroidvania. You must find character unlocks and upgrades scattered randomly across the game to access new stages.