On the Xbox Live version of "1 vs. 100", can you play along even if you aren't "The One" or in "The Mob"?

Yes you can. You can even get achievements on this version of it!

@SomNinja Are they different achievements than in the extended play version?

I don’t think so, no.

In the “Real” version of it, you will play as a spectator, but in the “Extended” edition, everyone is in the mob.

yes, you know you’re the crowd if your background is blue. if your background is gold you’re in the mob. if you’re the one…well, you’ll know you’re the one. :)