From Tunngle Wiki
Tunngle Basic is 100% free and always will be!
Yes, your heard that right, there are no hidden tricks, Tunngle Free accounts will always be 100% free!
Tunngle Free Accounts are not a joke. You will be able to play any game you like, use your messenger and enjoy your Tunngle experience.
If then you'll choose to try the full power of Tunngle, you will always have the option to upgrade to a Tunngle Premium Account.
What will never change is our promise to keep the Tunngle Basic Accounts always feature packed and free.
The Basic feature list can be found here.