Large numbers of the Ring Beam Units have been installed in four long interconnected corridors leading to Room MW. They are completely indestructible, and every few seconds will fire Rinkas directly at Samus Aran.
The Rinkas move slowly but cause severe damage, and are more than enough to distract Samus from opening the many Multi-Lock Blast Shields blocking the path ahead. In addition, these particular Rinkas have lost their ability to pass through solid surfaces and instead bounce off of them, making them more dangerous. Samus can destroy them using her Arm Cannon or Screw Attack. If two such projectiles collide both will implode and vanish.
"Placed on walls, they aim at Samus and fire using a Rinka. The Rinka can be destroyed."
- A similar turret appeared in Metroid Prime 3: Corruption. During the battle with Aurora Unit 313, there are mechanisms located on the floor that shoot red projectiles similar to Rinkas.
- Ring Beam Units are very similar to the cannons used to defend Mother Brain in Tourian. In Tourian, Rinkas spawn from specific blocks; although these blocks are referred to as turrets or cannons, they do not resemble Ring Beam Units and are most likely a separate type of mechanism.
|Non-hostile|| Aurora Unit 217 • Baby • Dachora • Databot • Etecoon • Fleet Admiral Castor Dane • Fleet Mechanic • Pow • Septogg • Tatori • Tatori, Jr. |
Training Drone • Watchdrone • Work Robot
|Hostiles|| Aazelion • Airthorn • Autom • Big Metroid • Cannon • GMX-04 Halberd-class turret (if provoked) • Polyp • Proboscum |
Puromi • Ring Beam Unit • Ripper II • Samus Eater (Bud) • Seed platform • Unfreezable Metroid • ZipNMEBomber
|Misc.|| Bloatsac • Blueroot Tree (Dark) • Butterflies • Chomper Fish • Durable plantform • Fish • Fungus • Glow Stem • Great Tree |
Massive tentacle • Moth • Parasitic fungus • Protozoan • RedGrass • Sandgrass • Sbug • Scarp • Scatterbug • Tallon fern • Mantha