Metroid

1. Shoot the first door to open it. Blue doors open with a single beam shot; red doors take five missile blasts, and a rarer third type takes ten. The game never tells you this.

2. Farm the first corridor for 30–45 seconds before you move right. Enemies respawn the moment you scroll them off-screen. Fill your health bar, then grab the Morph Ball in the room to the right.

3. Go left from the start, not right. The Morph Ball room connects to a vertical shaft that drops into Brinstar. The rightward path dead-ends fast and costs you time.

4. Prioritize Missiles over beams early. Missile expansions hide everywhere — shoot walls, bomb floors, check dead-end rooms. You need 30+ Missiles before Kraid and Ridley become manageable.

5. Bomb every suspicious floor tile and wall junction. Morph Ball Bombs reveal 90% of Metroid’s hidden paths. Energy Tanks, Missile packs, and entire route shortcuts sit behind unmarked destructible blocks.

6. Grab the Ice Beam in Brinstar before you fight Kraid. Frozen enemies become platforms — essential for vertical traversal and crowd control. It’s in a tall shaft accessible from the main Brinstar elevator.

7. Dying resets you to 30 health at the start. Metroid has no save-state health restoration. Before boss attempts, farm enemies near the boss door until your energy is full — this is not optional.

• Farm the first vertical shaft before you leave Brinstar. The Skrees and Zeelas respawn endlessly; grind them for energy and missiles before you push deeper. You need the buffer before the Varia Suit mitigates damage scaling.

• Kill Rippers with five missiles to force energy drops. Metroid’s drop algorithm favors energy when you missile-kill Rippers instead of beaming them. Use them to top off before boss fights.

• The Ice Beam + Missile combo is the only reliable Metroid counter. Freeze a Metroid, then fire five missiles while it’s immobile. Unchilled Metroids require 50+ missiles and will drain you to near-death. The Ice Beam is mandatory for Tourian—don’t skip Norfair’s ice-chamber detour.

• Doors stay open for ~2 seconds after unlocking; sprint through to save missiles. The game holds the open state for 120 frames. At full run speed you can chain through multiple red doors with a single missile by timing your shots as you approach the next barrier.

• Energy Tanks are permanent; refills are temporary. If you’re at 99 energy with six tanks, dying resets you to 30 energy—the tank capacity persists but the fill does not. Always refill before save-warping or intentional deaths; the password system only stores tank count, not current energy value.

Early Brinstar missile door with no visible missiles. New players circle the first few rooms hunting the five missiles needed to crack red doors. The solution: shoot every ceiling block in the vertical shaft immediately left of the starting elevator. One hides the first missile tank. The NES manual mentions “hidden items” but gives no specifics; early Nintendo Power coverage emphasized shooting suspicious tiles.

Kraid’s Lair entrance in the lava maze. The vertical shaft network below Brinstar has no map and multiple false paths. Players burn energy drops wandering dead-end corridors. The correct route: from the first lava room, go left through the narrow passage (requires Morph Ball), then navigate the zigzag descent. The red door at the bottom-right of this network leads to Kraid. Marking explored shafts on graph paper was the era-standard solution before GameFAQs ASCII maps.

Ice Beam location after Kraid. Defeating Kraid doesn’t automatically reveal the Ice Beam chamber. The beam sits in a hidden room in upper Norfair, accessed by bombing a floor tile in the corridor connecting Norfair to Brinstar. Without it, Metroids in Tourian are nearly impossible—they require freezing before missile volleys. The game never signals this requirement; players who skipped the Ice Beam hit a brick wall at the final area.

Tourian Metroids with inadequate missile count. Each Metroid requires five missiles after freezing. Tourian contains multiple Metroids in sequence with no refill stations. Players who rushed through Norfair and Ridley’s Lair with 30–40 total missiles run out of ammunition halfway through the gauntlet. The unblock: backtrack to Norfair and farm the missile recharge rooms, or restart with a routing plan that collects 100+ missiles before Tourian. TASVideos documents the minimum-missile Tourian clear at 75 missiles with perfect execution.

Mother Brain’s glass shield. The final boss sits behind a breakable barrier that absorbs missile damage slowly. Players waste missiles shooting the Brain directly, wondering why health isn’t dropping. The solution: roughly a dozen missiles per Zebetite barrier first, then close to 30 more missiles on the exposed Brain. Energy tanks are critical—five minimum for survivability against the Rinkas and turret crossfire.