WOOOORRRRK!
About
This game requires 3 or more players and a microphone., but is designed for 20 - 200 players in an auditorium. Works well at conferences.
First team to finish building their tower wins! Shout when your team color lights up, the louder you yell the faster they work.
Sort of a turn based racing game and not just about yelling as loud as possible all the time.
If you play with a huge crowd give them different vocals to shout so it's more clear what's going on. I recommend: AAA,III,OOO.
Former version was called AAARRGH and you can read about the prototypes at the Copenhagen Game Collective Blog.