A seven-person team created World of Fourcraft during a weekend hackathon at New York’s General Assembly , using Foursquare check-ins as pieces in the battle for nerd supremacy.

From Mashable:

“World of Fourcraft” uses Foursquare and Google Maps APIs to turn New York City into a giant game of Risk. Users decide which team they are on by swearing allegiance to one of New York City’s five boroughs. Checking into a neighborhood on Foursquare is the online game’s equivalent to placing plastic man on a country in the board game. An algorithm decides who owns each neighborhood using the number of people who have checked into it on each team. There are currently about 100 players.

If you’re worried that playing this might make you look like a big ol’ nerd, don’t worry, it was designed that way.

“There are no prizes. There are no celebrations. The only reward is the feeling of pride you normally only get from being re-tweeted,” explain the rules on the site.

Game on.

World of Fourcraft