The official No-Intro database lists the checksums for Goldeneye 007 (USA).z64 . If your file matches those hashes, you know it’s authentic. The inclusion of the -u- in the wild usually indicates a scene release that predates or mimics the No-Intro standard.
Note: While digital preservation protects media history, downloading ROM files of games you do not physically own violates copyright laws in many jurisdictions. Users should utilize hardware dumping tools to back up their own physical cartridges legally.
The ability to save at any moment allows players to easily navigate some of the game's more difficult, trial-and-error segments.