In the world of gaming, hidden features and unlockable content often add layers of excitement and discovery. One such intriguing secret lies in linking Metroid Zero Mission to Metroid Fusion on the Game Boy Advance. By connecting these two iconic titles with a link cable and holding down START + SELECT while booting up Fusion, players can unlock the exclusive Metroid Fusion picture gallery within Zero Mission. This clever crossover not only enhances the gameplay experience but also bridges the narratives of these beloved games.