
Each hive has 64 health, meaning they each take 3 missiles and two normal beam shots. Go right, and destroy the second and third hives, then go through the door. Go into the hidden tunnel at the top-left corner of it and destroy the hive to get MISSILE TANK 2. While climbing up this shaft, if you're not full on missiles, kill a few geemers to grab some missile drops, as you will need them for the notorious hive room. Make sure you have at least 3 missiles after blowing up the door otherwise you should either reset or farm for more missiles. Climb up this shaft and blow up the red door on the center-right. Try to make sure you're at full health, since you will want missile drops for the hive room. Fall down this shaft and go through the bottom-right door. When you reach the second door on the right, shoot the ceiling above it to fall through without having to get long beam. Climb up this shaft, using jumps and walljumps. Activate it to watch the map, then go right. Keep rolling until you reach the chozo statue. Roll under the platform and continue right. Run left and immediately get MORPH BALL. Each bullet point is one room (sub-bullet points are additional notes for that current room). This section will detail strategies for every single room in the Any% Route of Metroid: Zero Mission, following the general route above. Chozodia - Do suitless section, then clear the game without getting power bombs. Kraid - Do AWS, get Unknown Item and beat Kraid. Norfair - Get Hi Jump on the way back up to Brinstar. Ridley - Get two super missile tanks, Unknown Item, and beat Ridley.
Norfair - Get Ice Beam and refill there. Crateria - Get Unknown Item and Power Grip. Brinstar - Get Morph Ball, Missiles, Bombs, maybe Charge Beam, go to Norfair. Thus this guide will go over the details for the Ridley First route. The Kraid First route is rarely used, the primary reason being that it includes an extra cutscene, requires horizontal bomb jumping for acid worm skip, difficult kraid fight, and is ultimately slower in both in-game and RTA timing. This is the standard route used for any% today. The Ridley First route is confirmed to be faster than the Kraid First Route, both in-game and RTA time.
Leaderboards for Metroid: Zero Mission Any% can be found here Routes