Full disclosure - I was given two free tickets to Alibi to check it out. I've been in Vegas for 9 months and brought a friend with that has been here for 4 years so we had a bit of city knowledge in her and none in me. ;)
All in all it was a fun time, you definitely have to be outgoing and willing to deal with weird in order to like this scavenger hunt. Like the mime...look out for the mime...
We had a group of 6, 4 of them being tourists. I don't want to give too much away, so after meeting up with the first actor you follow clues on your own to meet up with the next actor and so on and so on. It was entertaining although I wished it was still downtown, I think that's just the local in me...
I highly recommend it if you want to get out and have some fun while you are visiting Vegas.