The Room 2 on iPad, provided you have the key - the key being $5 spare in your App Store wallet. iPhone and Android users will have to sit and wait outside The Room 2, as it won't unlock on their devices until sometime next year.
The game's App Store description doesn't give too much away in terms of plot, asking players to "follow a trail of cryptic letters from an enigmatic scientist known only as 'AS' into a compelling world of mystery and exploration." It doesn't require a detective to work out that fans of the first game can expect more elaborate mysteries to decipher and plenty more fiddly locks to open, all rendered in a tactile 3D engine.
Fireproof will be hoping to repeat the success of the first game, which picked up Apple's iPad Game of the Year award and sold over 2 million units. To celebrate the second game's release, Fireproof is making The Room free on the App Store for a limited time.