YA Fiction - kids were recruited to compete (maybe one from every country or state?) and traveled around the world - had a time limit, maybe 10 days? Had a very specific list of rules they had to follow

[Saskia]

I probably read this in about 2009
I feel like the number 10 was in the title but I’m not sure why...
I remember this one specific scene - they weren’t allowed to steal but they used a fake quarter in a pizza vending machine in japan and were almost disqualified?
Adults were like the “agents” for the kids
Does this ring a bell for anyone? I can’t seem to figure it out..

[Tab]

The Gollywhopper Games ?
Anything about the cover?
Who was the main character?
Part of a series?

[Erika]

Sounds like it might be part of the 39 Clues series....