Hatches

Hatches are the primary type of door seen in Planet Zebeth, Subsector Hiroshi, and Shades of Defiance. They come in various types, but Blue Hatches are the most common.

Open Hatch
Open Hatches are a type of Hatch that cannot be closed or does not automatically close. They are found exclusively on ZR388, due to that planet reusing data from Metroid II: Return of Samus.

Blue Hatch
The Blue Hatch is the most commonly encountered type of hatch; most basic attacks, including Kraid's Spikes, the Power Beam, and Ridley's Fireballs, can open it.

A variant of the Blue Hatch exists that can be easily converted into a different type of hatch; these appear identical, but can be 'locked' so that they require a specific type of weapon to open it. This variety is most notably used in Ridley's Bar.

Missile Hatch
The Missile Hatch, or Red Door, is another common type of hatch, being the most common type of "locked" hatch there is. It is the only hatch type known to exist on both Zebeth and ZR388, and it is the only type of locked hatch that occurs "naturally." They are usually seen blocking off an item room or the room a boss is fought in.

Ridley also occasionally converts one or more of the Blue Hatches in his bar into Missile Hatches to serve as a line of defense.

Super Missile Hatch
In strip 024 of Subsector Hiroshi, "That's an odd colour," Ridley 'locks' the front entrance to his bar by converting the Blue Hatch placed there into a Super Missile Hatch, assuming Samus would be able to get through it; however, due to not having acquired Super Missiles, Samus was unable to do so, forcing Ridley to open the hatch himself when she arrived.

Wave Beam Hatch
Shortly after the two 'Samii' attacked Kabutroid, she 'locked' the room containing Ridley's alcohol supplies (or the 'booze room') as a Wave Beam Hatch. She also later locked the door to Kraid's Pog Room in a similar manner shortly after giving him a poster depicting Samus.

When the Zebesian entered the bar, his own beams were similar enough to Wave Beams to trigger the door mechanisms, unlocking the Wave Beam Hatches.

Power Bomb Hatch
In the commentary for "That's an odd colour," Hiroshi offhandedly mentions that he originally intended for Ridley to lock the hatch leading into his bar with a Power Bomb Hatch, but figured that that would be excessive, and noted that it didn't look well against the black background.

Fireball Hatch
Ridley will occasionally lock doors in his bar in a manner that causes them to turn purple and respond only to his fireballs. In Subsector Hiroshi, they are given the name "Dragon Doors." In Planet Zebeth, they are referred to simply as "Purple Doors".