Doom 2 (or Doom II in roman numerals), is a sequel to the first-person shooter video game Doom. It was created by iD Software, and came out in 1994. It was based on the same game engine as Doom, and had 32 levels. Doom 2 has now got newer enemies and weapons.
Doom II has an expansion pack, Master Levels For Doom II. The master levels has twenty Pwads, each Pwad has a level. One of the Pwads has two levels. The Master Levels were extra levels created by the level designers of id Software.