Via cscout, this cool location-based game from Korea: Shoot Me If You Can (Taeyoon Choi):

Shoot me if you can is an urban game inspired by first person shooting online video game. Replace gun with fun, and shoot the opponent team with a cellular phone equipped with a digital camera. Participants; shooters are given team color and phone number printed on the sticker. Shooters are ought to take a picture of the opponent team. If successful, she/he sends the picture to the opponent team member, via multimedia SMS system. Different rules exist for variations in game. Tactics is important part as well as team work and understanding of the urban environment. This work is a commentary on abundance of digital image in our culture, desire to photograph and violence of surveillance camera. Active public participation in encouraged through website and the game.

Why do I blog this? it sounds like an interesting example of urban computing game!