The version of GoldenEye 007 that was released was technically a ROM hack of the version submitted to Nintendo for final certification. While the game was undergoing said last-minute testing, an issue was discovered with the game's memory that caused glitches in the textures featured in the Frigate level. To combat this, programmer Mark Edmonds wrote a tool to extract the game's code and data from the ROM, adjusted the hex values in the game's memory to improve the performance in the level, recompressed it, and directly added it back into the ROM image without recompiling. This version was sent back to Nintendo and certified for release as the final version of the game.