In Metroid for the NES, there are 21 total missile packs hidden around the map that increase your total missiles by 5 each. This makes it easier to maintain a consistent missile count throughout the game, and makes all bosses much easier. Below is a Metroid Missile Pack Guide that will guide you through getting all missile packs in Metroid.
How to Get All Missile Packs in Metroid
Brinstar
How to get Brinstar Missile Pack #1
From the start of the game, go right until you reach a long vertical blue room. Go up until you see a door to your right. Enter it, and after a short hallway, go down until you see another door to your right. Enter it and, after some platforming, you will see the missile pack in the center of some floating pillars.
How to get Brinstar Missile Pack #2
From the start of the game, go right until you reach a long vertical blue room. Go up until you see a door to your right. Enter it, and after a short hallway, go up until you see a door on your right. Enter it and go right. Take the top tunnel using your morph ball and continue right. The missile pack is in the center of three floating pillars.
Norfair
How to get Norfair Missile Pack #1
From the beginning of Norfair, go left immediately and keep going to reach the missile pack.
How to get Norfair Missile Pack #2
From the beginning of Norfair, go left immediately and keep going, past the first missile pack until you reach a wall. Then, bomb the wall and go left. Continue down this path going down, then right, to reach a dead-end and the missile pack.
How to get Norfair Missile Packs #3-5
From the beginning of Norfair, go right immediately and keep going right until you reach a tall vertical passageway. At the very top, there is a door that leads to 3 missile packs.
How to get Norfair Missile Packs #6-7
From the beginning of Norfair, go right immediately and keep going right until you reach a tall vertical passageway. At the very top, go to the right most ledge and shoot up. This reveals a secret passageway that leads to 2 missile packs.
How to get Norfair Missile Packs #8-9
From the room where you find the Hi-Jump Boots, bomb under the upgrade to reveal a secret passageway that leads left. Continue left until you reach a green vertical tunnel with lava at the bottom. Enter the lava, which won't hurt you, and bomb down to reach a secret area.
Go right, and when you reach a normally empty green hallway, bomb next to the right most door to reveal a secret area. Go down, and to the right there will be 2 missile packs.
How to get Norfair Missile Pack #10
From the room where you find the Hi-Jump Boots, bomb under the upgrade to reveal a secret passageway that leads left. Continue left until you reach a green vertical tunnel with lava at the bottom. Enter the lava, which won't hurt you, and bomb down to reach a secret area.
Go right for five more rooms and then bomb open a secret passage over some destructible blocks. Continue right, and at the end of this journey you will find a single missile pack.
How to get Norfair Missile Packs #11-12
From the beginning of Norfair, go right until you reach a tall vertical passageway. Go down, but not past the hidden hole in the ground, then take the door on the left. Keep going until you reach a dead-end, and then bomb your way to 2 missile packs.
Ridley's Lair
How to get Ridley's Lair Missile Pack #1
Upon entering Ridley's Lair from Norfair, go immediately left and keep going until you reach the second gray hallway. Shoot up until you see an opening. Go up, then use your Hi-Jump Boots to go left and the missile pack will be at the end of the next hallway.
How to get Ridley's Lair Missile Pack #2
Upon entering Ridley's Lair from Norfair, go immediately right, and fall all the way down the next tunnel. Go left at the final door, and keep going left. The missile pack will be after your second jump.
How to get Ridley's Lair Missile Pack #3
Once you have entered Ridley's Lair, go left until you reach the energy tank. Drop down below the energy tank by walking towards it. Then, go right until you reach another drop. This jump is tricky, but is possible.
If you make the jump, you'll be in the same room as the missile pack. If you fail, you must go right and up again to retry.
Kraid's Lair
How to get Kraid's Lair Missile Pack #1
After entering Kraid's lair, take the first red door to your right. The missile pack is in the center of this room on some floating pillars.
How to get Kraid's Lair Missile Pack #2
After entering Kraid's lair, take the first door to your left. This room looks like a dead-end, but bomb it and it reveals a secret tunnel that leads to the missile pack.
How to get Kraid's Lair Missile Pack #3
After entering Kraid's lair, take the second door down on your left. Follow it, and drop down into the lava at the end of the path. Then, walk to your right for several screens and the missile pack will be there, sitting on some floating pillars.
How to get Kraid's Lair Missile Pack #4
After entering Kraid's lair, drop down and take the third red door on your right. This is a bit of a tricky jump, but hold right and you should make it. Then, continue right. Finally, as you are about to drop into the pit on the far right side of Kraid's Lair, hold left to drop onto a door that holds the missile pack.
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