We finished the first season of this at the weekend :

It's a Japanese show that mixes fantasy, sci-fi, thriller and gaming with touches of humour.
Three friends unwittingly go through a portal in downtown Tokyo to emerge on the streets to find they're alone, like the whole place is a ghost town. Eventually, after a series of events, they end up walking through some kind of electronic trip-wire-wall and find they're in a game. A real life game, like a video game, but actually live ..
They have to solve puzzles to survive and the first game involves playing together as a team, with the added ingredient of a woman none of them have ever met before who also happens to have stumbled in there.
As the series unfolds, they find there are people about but not many and they're all involved in the games as to win allows you more time in the city - a visa with a number of days on it - but if you lose, you are eliminated .. for good.
It's really unique and perfect for anyone into sci-fi, video games and fantasy : ie, me
