Metroid

Metroid puts the player against the evil Mother Brain. You are inside the fortress planet Zebes, a planet of endless secret passageways where the Metroid are multiplying. Left alone the Metroid are harmless, but in the wrong hands they could destroy the galaxy. It is up to you to prevent the Mother Brain that controls Zebes from using the Metroid for evil purposes. You use your spacesuit to absorb valuable energy and search for power items such as the Ice Beam, Wave Beam, High Jump Boots and Varia. The player controls the bounty hunter Samus Aran in a side-scrolling action game with a large, connected map. Zebes is split into areas such as Brinstar, Norfair and Tourian. Many routes are blocked until Samus finds the item that opens them, so exploring and backtracking is part of the game. Samus can curl into a ball to fit through narrow tunnels and place bombs. Missiles open red doors and damage tougher enemies, and Energy Tanks raise her health. Bosses such as Kraid and Ridley guard the way to Mother Brain. The game saves progress using a password.