A clone of the at-the-time-Japan-only-release Rittai Picross (立体ピクロス), a 3d take on classic Picross. The goal of the project was to learn Javascript, O3D (Google's abandoned 3d Web Browser plugin) and basic shader writing while bringing an addictive game to audiences that wouldn't have had a chance to play it otherwise. The port featured an in-engine editor for constructing your own puzzles and sharing them.
Rittai Picross made a short round in Newgrounds.com (remember them?) but unfortunately relies on O3D, Google's long abandoned abandoned 3d Web Browser plugin built on early WebGL.