SCVNGR is a game all about going places, doing challenges and earning points. The game is played from a custom app on iPhone and Android as well as via SMS. It is not a text message scavenger hunt. Instead of riddles to guide you to a place, SCVNGR concentrates on completing challenges at a particular location.
P. Backlund, and M. Hendrix. Games and Virtual Worlds for Serious Applications (VS-GAMES), 2013 5th International Conference on, page 1-8. (September 2013)