Big Games = games that combine virtual and real physical aspects and are played over a geographical area
Citation from 
"Big Games can be both large and small. The playing field may be an entire city or a park or basketball court. Gregory talked about two games, pacmanhattan and Payphone Warriors. Pacmanhattan used the grids of streets as a pacman grid and Payphone Warriors is a version of capture the flag using city payphones. Currently, these games require lots of set-up and management. Payphone Warriors requires a scorekeeper and most games require several months advance setup. Gregory spoke about the great future potential of these games and working to have the cellphone be a gaming device on the level of a basketball — ready to play without any configuration/setup." ()
Big Games Constraints
revenue - bandwidth, etc. are all expensive, how do you monetize the game?
seams - connectivity issues and wifi cloud boundaries can be part of gameplay adaptablefield
accuracy - fixing the exact position of the gamer is difficult" ()
See the Big Games Podcasts