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Xi is a mystery, investigation game that exists primarily within Home, with clues and tasks that sometimes cross over into the real world.

The basic premise is that there is a world beneath Home called the Alpha space (accessed through the Hub), involved in the Alpha testing of Home. The characters within Xi are tied to the development of Home and one of them has disappeared for reasons unknown to the rest of the team.

Everything is task oriented, with new tasks and clues being released on a regular basis. Additional background information is provided through blogs (made by characters within the game), text message conversation logs and additional web sites.

Some are as simple as finding objects within the Hub (the underground Home space in which the game takes place) to following up clues on the internet (often within Home using the PSN browser) and even relying upon other players to physically track down clues placed at real world co-ordinates provided through the resources within the Hub.

Other tasks are games within the game (timed flash type games, motion controlled racing game) that your avatar plays, so there is a mix between investigation and traditional game play elements.