It sounds like you're referring to a 190-in-1 NES ROM pack (specifically version 18) — likely a multicart-style ROM image used in emulators or flash carts.
Furthermore, the technical constraints of the multicart often resulted in a fascinatingly broken user experience. To fit so many games onto a single chip, compression was often aggressive, and memory management was clumsy. Players became accustomed to games that would crash randomly, music that would glitch into static loops, or save functions that simply did not exist. These cartridges were not polished commercial products; they were utilitarian vessels for data. This ruggedness contributed to their mystique. Beating a game on a multicart felt like conquering a frontier, as one had to contend not only with the game's difficulty but also with the instability of the pirated hardware. 190 In 1 Nes Rom 18
Tip for enthusiasts: Look for the hidden menu in Rev 18. On the title screen, press Up, Down, Left, Right, B, A, Start. This unlocks a secret "prototype" section containing a beta version of Bio Force Ape—one of the most famous lost NES games. It sounds like you're referring to a 190-in-1
Some of the notable games included in the 190-in-1 NES ROM are: Convenience : The ROM pack offers a convenient
190-in-1 NES ROM Hack Review: A Nostalgic Marvel or a Messy Mashup?
Despite the bold "190-in-1" claim on the label, the actual number of unique games often varied significantly between different versions of the cartridge: Unique Titles vs. Duplicates : Many versions contained only 89 unique games
While "Rom 18" might sound like a specific version number or a file designation found on a particular ROM site, it generally denotes one of the many floating variations of these pirated compilations that were rampant in the 1990s.