Missile Expansions increase your maximum missile capacity by 5 missiles each. There are numerous Missile Expansions to find across all planets, and collecting them is essential for dealing with heavily armored enemies and solving certain puzzles that require missile blasts. Some expansions are out in the open, while others are cleverly hidden behind destructible blocks, in secret rooms, or require specific Beam Combos to access. Just like Energy Tanks, thorough exploration and frequent use of your Scan Visor are key to finding these. Many boss battles and mini-bosses require a significant number of missiles to defeat, so having a high capacity is a major advantage. check every nook and cranny, and revisit areas once you've acquired new abilities that might unlock previously inaccessible paths.
While Metroid Fusion traditionally grants a mere two additional projectiles per pickup, these expansions follow the series standard by increasing Samus’s total capacity by five.