Icon of Sin

Icon of Sin trivia questions

1. In 1994's Doom II, what weapon was newly added to the arsenal?
2. In 1994's Doom II, which enemy type was newly introduced?
3. Doom II was first released for which operating system in 1994?
4. Which platform got Doom II the year after its 1994 MS-DOS release?
5. What was the 1995 expansion pack with 21 new levels called?
6. Which expansion adds nine extra levels to Doom II?
7. In what year did Doom II arrive on Xbox Live Arcade?