These devices are considered because the manufacturers are selling ROMs (game data) without licensing fees. While you personally are unlikely to be sued for buying one, the devices frequently get removed from Amazon and eBay for copyright violations.
These devices are usually one of two things:
: Classics like Streets of Rage II , Golden Axe , Altered Beast , and Alien Storm .
The locals—those who appeared in more than one game—began to recognize Milo across titles. A shadowy mailman who glitched in a corner of one dungeon became the mayor of a seaside town in the next. A girl who sold wooden stars in “Sidewalk Bazaar” was the same girl who sold map pieces in “Midnight Tram,” her hair fading the further from dawn she wandered. When Milo helped one of them, their presence would change in other games: a boarded-up shop reopened; a poem left in “Moon Alley” would be found in a different game’s mailbox the next time he played.