if you mean- Does Black and White 2's expansion pack need the game itself, then yes. The expansion pack is an add on the the game. If you do mean the first game, then no. The you don't need the 1st and the 2nd.

Yes you have to have the actual game for the expansion packs to work.

It's a Sims 2 expansion pack so you need Sims 2.

MechWarrior is an action simulation game online, however there is also the video version called MechWarrior (or Battletech in Japan), which is a first person action video game and which was the first game in the MechWarrior series.