I mean. COME ON!
Challenges can be created by users from a tool on SCVNGR’s website, though the creation tool won’t be deployed for the consumer version of the product for a few weeks. SCVNGR wants people to get the opportunity to interact with the app as it is before adding more content. (via SCVNGR Puts the Game Back in Location-Based Gaming
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Nike turns the streets of London into a giant game board, inviting participants to run through the city and check in at various phone booths (phone boxes, if you live in England). The more check ins that you get, the more points you earn. (via brandflakesforbreakfast: nike creates foursquare with pay phones)