Main Plaza

The Main Plaza is a room in the Chozo Ruins in Metroid Prime. As the name implies, it is the main room of the area. The room is composed of three sections: the lower section, which includes the Boost Ball ramp and gives access to the Ruined Shrine and the Tower of Light; the middle section, which gives access to the Hive Totem; and the top section, which includes the bridge and gives access to the Fountain.

The lower and middle sections are filled with Beetles. Later in the game, though, the Beetles on the lower section are replaced with a Plated Beetle, and the ones on the middle section disappear entirely. The upper section contains a War Wasp hive.

Missile Expansions

 * In the lower section, there is a Boost Ball ramp. Boost your way into an alcove to obtain a Missile Expansion.
 * There is a tree in the lower section. Fire a Super Missile at the weakened portion of it, then jump into the newly-made alcove to obtain another Missile Expansion.
 * You must come here from the Training Chamber. Use the Grapple Beam on the Grapple Icon and swing to the other side to collect the last Missile Expansion.

Energy Tanks

 * Go to the Main Plaza from the Vault. The Energy Tank will be right in front of you.