Interestingly, the Metroid II gallery features an art piece of the baby that had never been released prior. The galleries include concept art from both games. Samus amiibo will unlock the Metroid II gallery, and using the second Samus amiibo specifically created for Samus Returns unlocks the gallery for the same game. Both galleries become available to unlock after completing the game once, and scanning amiibo. There are two galleries in the game, the Metroid II: Return of Samus Gallery and Metroid: Samus Returns Gallery. The five North American endings (which are included in the Japanese version as well) are primarily fan-service, depicting Samus in her revealing Casual Outfit. These endings depict moments from Samus Aran's past, such as the attack on K-2L and her training with the Chozo. Additional endings exclusive to the Japanese version can be unlocked with Child Mode enabled (which enables kanji text). The endings are unlockable by completing the game on Normal and Hard Mode in under certain times and with a certain percentage of the items.

The Fusion Gallery is unlockable only in the Japanese version, and can be accessed on the Title Screen. This allows them to view the endings at any time, without having to complete the game all over again. Both of the Game Boy Advance-based Metroid games feature galleries that unlock after completing the game at least once, and include each ending that has been unlocked by the player.

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