What they are A 300‑in‑1 NES ROM is a single cartridge image that contains roughly three hundred distinct games for the Nintendo Entertainment System (NES). These compilations were typically produced by unlicensed manufacturers in the late 1980s and early 1990s, often marketed as “multicarts” or “mega‑games.” Common origins | Region | Typical manufacturers | Notable branding | |--------|----------------------|------------------| | Asia (Taiwan, Hong Kong) | Yong , Tengen , Apex | “300 in 1”, “Super 300” | | Europe | Codemasters (unofficial), Eurosoft | “300 Games” | | North America | Rare, mostly bootleg imports | “300 in 1” (often mislabeled) |
