Metroid II: Return of Samus is the second game in the Metroid series, taking place immediately after the events of the NES Metroid. Samus arrives at the planet SR388 to exterminate all Metroids and eventually succeeds.
This run extensively glitches the game to the point where Samus moves to rooms that are glitched and/or weren't there before. Reading the submission text for more information on the methods and glitches used is heavily recommended.