Here is the ethical and legal reality check, which any responsible guide must include:

Only download ROMs for games you physically own to stay within "fair use" guidelines. Avoid .EXE files:

The NES was king of the platformer. A top-tier ROM pack requires a mix of Nintendo first-party titles and difficult classics (often referred to as "Nintendo Hard").

A "ROM pack" is a collection of ROM files, which are digital copies of the data from game cartridges. The "Top 100 Full" designation suggests a curated pack that goes beyond including every game ever made. Instead, it focuses on the best of the best—the titles that defined the system.

The original introduced open-world exploration and battery-backed saving, while the sequel experimented with side-scrolling action-RPG mechanics.