After completing the main story of Metroid: Other M, there's still plenty to do for completionists and those seeking an extra challenge. The game offers incentives for revisiting the Bottle Ship and achieving 100% completion.

- 100% Item Collection: The primary post-game activity is to find all remaining Energy Tanks, Missile Tanks, and Power Bomb Tanks. With all abilities authorized, exploration becomes much easier.
- Secret Message Data: Collect all the hidden Secret Message Data files to fully understand the game's lore and unlock a special ending sequence.
- Hard Mode: Upon completing the game, you unlock 'Hard Mode'. This mode features tougher enemies, reduced item drops, and no Concentration ability, offering a significant challenge for experienced players.
- Theater Mode: Unlocks after completing the game, allowing you to rewatch all cutscenes.
- Sound Gallery: Unlocks after completing the game, allowing you to listen to the game's soundtrack.
Achieving 100% completion requires dedication and thorough exploration. Hard Mode provides a true test of your Metroid: Other M skills. Enjoy the additional content and challenges!