I have just noticed that the classic adventure game iOS The 7th Guest is available for free as a May Day offer on the iTunes store. While here in the UK the 1st of May is about to expire it might not be too late for other parts of the world.

This is one of the truly defining adventure games of the early 1990s and well worth checking out if you have an Apple device and want a classic slab of retrogaming on it or if you remember the game itself and just want to have another go at some of its puzzles.