What is the subtitle of the second Metroid Prime game?

What is the subtitle of the second Metroid Prime game? The subtitle of the second Metroid Prime game is Echoes.

Its full title is Metroid Prime 2: Echoes. Developed by Retro Studios and published by Nintendo, it debuted for the GameCube in 2004 as the direct sequel to Metroid Prime. The game later appeared in an enhanced Wii version and in the Metroid Prime: Trilogy collection.

Echoes sends Samus Aran to Aether, a planet split between light and dark dimensions. She becomes involved in the conflict between the Luminoth and the hostile Ing, while also confronting Dark Samus. The light-and-dark structure is the game’s defining story and gameplay idea, with Samus moving between parallel versions of the same world.

Players sometimes confuse the subtitle with Corruption, which belongs to Metroid Prime 3, or with Hunters, the Nintendo DS spin-off. In Japan, the game used the slightly different subtitle Dark Echoes, but Echoes is the canonical English subtitle.