Unlock Gallery Pages and Theater Mode Chapters
Chapter 1-26: Beat the final story boss.
Chapter 27-30: Beat the game.
Gallery Page 8: Beat the game with 100% Item Completion.
Gallery Pages 1-4: Beat the final story boss.
Gallery Pages 5-7 Beat the game.
Successfully complete the game. Then, return to the Bottle Ship after the credits end, and the locations of all items will now appear on the map. Additionally, you can see your percentage of collected items.
Complete the game to unlock Theater Mode and Gallery Mode. Also, the main menu music theme will change after you find Samus's "irreplaceable" object.