English: Diamond Trust of London paper prototype. Released in 2012, the game was developed by Jason Rohrer, with music by Tom Bailey. The game and its supporting assets have been released into the public domain and is hosted on SourceForge at http://hcsoftware.hg.sourceforge.net/hgweb/hcsoftware/DiamondTrust/summary (license)
Rohrer prototyped the game on paper before committing to code. A zoomed out photograph of the same scene is available at File:Diamond Trust of London - Paper Prototype.jpg.