Here is a video game projected on the side of a building, which sounds like a familiar idea, but Game Wall, by the Swiss film group &Söehne, incorporates the features of the wall into the game itself.
The ship in Game Wall must navigate the wall as a maze, using the brick as traversable space and the windows as boundaries. The score and lives are displayed on a window, too.
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&Söehne plans to release the game in a playable online version, soon, but it would seem the novelty depends on it being played outdoors, on this particular building - unless there is a ROM forthcoming, with a custom map-building setup or tool involved that this video doesn't show.
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