Metroid Prime: Realm of Madness is the sequel to the 2007 Wii game Metroid Prime 3: Corruption and is played on the Wii. The story revolves around a mental problem that Samus Aran, the main character of Metroid, develops after she destroys Phaaze and Dark Samus (who is Metroid Prime but in Samus's form). The game is the longest game for Metroid ever made, consisting of over 10 planets to venture in, 30 bosses in total (there are sub-bosses) and is of moderate difficulty.