Yes, both games are completely independent of each other.
You cannot play The Sims 3 without downloading it.
Yes you need the original Sims 2 and Sims 3 to play these games.
No, all three series of the Sims needs to be installed in order to play.
The Sims 3 world adventures is an expansion pack. You can only play it if you have already installed the Sims 3.
You do not. I play without signing in all the time.
No, because you don't need the sims (first one) to play the sims 2!
To play any of the Sims games, you MUST have the sims 3 installed. Without The Sims 3, you will not be able to download any other Sims 3 onto your computer or Pc
No.
no, expansion packs for the sims 2 won't work in the sims 3
Sims 3 high end loft stuff is compatible with sims 3 (it is an expansion pack). You can not play Sims 3 high end loft stuff without sims 3.
No. Guys also play The Sims 2. I'm a guy and I play it a lot along with The Sims 3.
The Sims 3 is a base game. If you don't have the base you can't play the Expansion Packs. Sims 3 Generations is an expansion pack. So to put that simply: No.