Not a game but rather an interactive toy, Shapefarmer is a multi-user Tangram system for use with Second Life.
"Shapefarmers" manipulate the pieces (“Tans”) of this traditional Chinese puzzle - inside Second Life - to create geometric animals, people, objects, etc.
Users then save their creations in a global database, where other users can view and rate them. They can re-load and edit their Tangrams any time. In “gallery mode”, Shapefarmer displays random selections from the
growing database of user submissions.
Components
Client - SecondLife proprietary "LSL"
Server - Perl