Other "Games With a Purpose" (GWAPs) include: * TagATune (also by Luis von Ahn) is an audio-based online game to produce annotations and tags for sound and audio files http://ismir2007.ismir.net/proceedings/ISMIR2007_p361_law. read more
The ESP game is a human-based computation game developed to address the problem of creating difficult metadata. The idea behind the game is to use the computational power of humans to perform a task that computers cannot (originally, image recognition) by packaging the task as a game. read more