the player's actions in near real-time. It has received favorable reviews from a number of mainstream game review sites. Game Design Sketchbook – In 2008 Rohrer created a number of games for The Escapist. These would usually be unpolished prototype games that explore a single theme, with an accompanying article by Rohrer describing the creative process of making games. Inside a Star-filled Sky – An "infinite, recursive tactical shooter" released in February 2011, favorably reviewed. Selected for presentation at the 2011 Tokyo Game Show's Sense of Wonder Night. The game was put by Rohrer into public domain, like many other games of Rohrer. Diamond Trust of London – A 2012 crowdfunded two-player strategy game for the Nintendo DS into public domain. The Castle Doctrine – An MMO burglary and home defense video game. Sold on Steam while being Public domain software. Cordial Minuet – A two-player online gambling strategy game played anonymously for real money. One Hour One Life – A multiplayer survival game of parenting and civilization building, released February 2018. Like the games before, public domain software and hosted on GitHub. GDC 2011 Game Design Challenge At the 2011 Game Developers Conference Rohrer won the annual Game Design Challenge by proposing a game that could only be played once by a single player and then passed on to another. This idea was based on stories of his late grandfather that had been passed down. He stated "We become like gods to those who come after us." With this in mind he created a Minecraft mod, Chain World, that was put on a single USB flash drive, which he then passed to an audience member. The rules of the game were simple: No text signs are allowed in the game, players may play until they die once, upon respawning they must quit the game and the game must then be passed onto someone that is interested and willing to respect the rules. GDC 2013 Game Design Challenge In March 2013 the Game Design Challenge was held at the Game Developers Conference for the final time. Its theme was "Humanity's Final Game." Rohrer was among the six contestants and won with his entry A Game For Someone, a physical game constructed of titanium. After its completion Rohrer buried it in an undisclosed location in the Nevada desert. At the challenge he released lists containing over one million discrete GPS coordinates,