It sounds like you’re asking about a multicart ROM set for the NES (Nintendo Entertainment System), typically labeled "190-in-1" or similar. The phrase "Nes Rom 18" might refer to:
Cons:
Legality: Downloading ROM files for games you do not own the physical cartridge for is generally considered copyright infringement. 190 In 1 Nes Rom 18
Hardware: Some versions of the North American cartridge are actually internal Famicom boards connected to a 72-pin adapter to work on standard NES consoles.
Unique Games: Most versions of this multicart contain between 42 and 89 unique games. It sounds like you’re asking about a multicart
A ROM hack is a modification made to a ROM chip, which contains the game data for a video game. In the case of the 190-in-1 NES ROM, the hack involves combining multiple game ROMs into a single, larger ROM file.
Hardware Origins: Many of these cartridges were produced in Taiwan or China and featured a Famicom board inside a North American NES shell via a pin adapter. 🖥️ How to Play Today Download an Emulator: Use Mesen or Nestopia UE
Tetris Variants: It often includes the Bullet-Proof Software (BPS) Japanese version of Tetris (which has different controls and lives) and the rare Tengen version that was famously pulled from shelves.