While Metroid II is a largely linear experience focused on the main objective of Metroid eradication, there are numerous optional activities and collectibles that significantly enhance Samus's capabilities and make the journey easier. These 'side quests' primarily revolve around finding hidden power-ups and expanding your resource reserves.
Thorough exploration is the key to uncovering these valuable items. Many are hidden behind destructible blocks, in secret passages, or require specific abilities to reach. Investing time in finding these upgrades will pay dividends in the tougher battles ahead.
Compare side quests & activities inMetroid Prime 4: Beyond