The World Caches:
There were 6 original World Caches in this series:
• Cambridge UK: Virtual World Cache - Cambridge University Museums by Datenkaros
• Australia: World Cache: ? ? ? (Australia) by Brad&Janet
• France: World Cache - The Clock/L'Horloge by Les Pandas
• The Netherlands: World Cache - Tulipiere by Vooruit!
• Portugal: Cruzado by World Cache (Portugal) by Jocasife
• The United States of America: World Cache - Historic Guthrie by Max and 99
And now we, the World Cache COs, plan to add six more. The plan is to have another Mystery Cache in each location. And each of these 6 new Mystery Caches will require more teamwork. So make sure you are familiar with the original 6 caches.
The aim of these World caches is for people to work together as a team to collect the world wide information needed, and for each cacher to only be a member of one team.
If, when you were younger, your kindergarten teacher wrote in your report “Does not play well with others” then this cache may not be for you ;)
(Optional) When you log this cache please include your team members' names in your online log.
After completing the required steps of the World Cache - Historic Guthrie geocache you can proceed to the instructions for the World Cache Final - USA (Oklahoma). Please do not share codes with other teams!

To find the World Cache Final - USA (Oklahoma) cache you will need to collect the secret codes from the five other countries. These are the same codes that teams collected for the Virtual World Cache - Cambridge University Museums GC7B7B5 plus the code from World Cache Final: Cambridge Museums GC7WPK9.(Optional) After you have shared the USA code with the other five members of your world team you can sign the physical USA final cache and log it online. Please remember, as per Geocaching guidelines: "As a geocacher, you should not sign the name of your teamwork partner in the log of your local cache. You can only claim a find if you visit the cache yourself."

You can validate your puzzle solution with certitude.