The world's most powerful lawn-mowing simulation.
If the XBox Live Indie Games programme hadn't fallen to bits, Avatar Lawnmower Simulator would have been my second commercial release for the Xbox 360. Written in C# for .Net Compact Framework, ALS relies heavily upon the Avatar API for XBox Live, and as such will not see a PC release. Using some very tightly-timed code the 3D lawn can be interacted with and mown by up to four players simultaneously.