квест

[joho07.livejournal.com]

Talked to a friend yesterday, and he said that there is a game - квест - which people play partially on the internet, but also have to play outside in the city. I didn't quite understand what he meant, but he said it is quite a popular thing to play, at least among his friends in the Ukraine.
I was wondering, if this is an equivalent of what a scavenger hunt would be in America? If not, does anyone know what this is?