Acclaimed puzzle game The Room is now free on Apple's App Store, the game's developer has announced.
Guildford based Fireproof Studios has waived the fee for the original game as part of a campaign to publicise its newly released sequel.
The Room, released in 2012, won Apple's Game Of The Year award and picked up a BAFTA award for Best British Game.
The original challenged players to figure out how to open a series of boxes, each containing a number of different locks, mechanisms and puzzles. The Room Two offers similarly perplexing gameplay, in which players follow a trail of cryptic letters from a scientist known only as 'AS'.
Promising realistic 3D locations, "innovative" touch controls and a dynamic soundtrack, the iPad version of The Room Two is available on the iTunes store for £2.99 / €4.49 / $4.99.
The sequel has not yet been released on iPhone, iPod Touch or Android devices, but Fireproof expects these will arrive early next year.
The Room has sold more than 3.8 million copies since its launch.