Eclipse is the long-lost Game Boy tech demo programmed by a young Dylan Cuthbert at Argonaut. It became the basis for the 1992 Japan-exclusive Nintendo game X, and from there fed directly into the Super Nintendo's Star Fox. The 3D experimentation pioneered here helped lead Shigeru Miyamoto toward Super Mario 64 and The Legend of Zelda: Ocarina of Time, making this mysterious demo one of the most historically important pieces of software in Nintendo's catalog.
This ROM also contains an object viewer that lets the player freely rotate and scale the fully 3D objects used by the game. On the original Game Boy screen these wireframe and shaded models were like nothing a Nintendo console, let alone a handheld, had ever displayed before. A reproduction cartridge of a genuine prototype, in English.