Gamasutra reports that the Minecraft mod resides in a USB flash drive. A player installs the Minecraft world on a PC, then is supposed to play the game until his or her character dies. The world has to be saved and a copy is then put on the USB drive to then be given to another person.
The USB drive was given to an audience member at GDC 2011. However that audience member, Jia Ji, decided instead of playing the game he would auction off the USB drive via eBay to benefit a charity. The auction agreement also requires that after the winning player gets the drive and finishes playing the mod he or she must give it to famed alternate reality game designer Jane McGonigal.
Gamasutra reports that move has been the source of complaints with many game developers saying that Jia Ji's auction does not fit with what Rohrer had in mind when he created Chain World. Even Rohrer himself states on his Twitter page that " ... Whoever wins Chain World auction should NOT mail USB stick" to McGonigal.