Tony Hawk grabs his skateboard as he jumps from the ramp during the X-Games in San Diego in 1998.
The San Diego County resident tweets clues and locations where hidden swag may be, then leaves it up to his more than 1.7 million followers to get there and claim victory. The winners must then tweet back to Hawk with a picture of themselves with the prize.
At the end of march, the local boarder launched his scavenger tweets for San Diego residents.
"I saw how prolific Twitter was, and I started doing, sort of, self-scavenger hunts, where I'd just hide stuff on my own generally in San Diego, and things were getting found within minutes ... you can see how much people [are] using this new technology," Hawk said.
The skateboarding Hall of Famer has now taken the hunt internationally. Followers are hunting down clues across the globe, ultimately leading them to a free surprise exhibition on Saturday at an undisclosed location somewhere in the Midwest.
"In the meanwhile, I'm trying to keep track of what's being found," Hawks said. "It's definitely a full-time job."