The World Lock is the highest tier lock apart from the Diamond Lock, Robotic Lock and Emerald Lock. It is only available from the Growtopia Store and costs 2000 Gems. It cannot be spliced using seeds and never drops any seeds.It cannot be destroyed.
World Locks is a type of currency like Gems. World Locks are the most common trading item around.
Store Info: "Become the undisputed ruler of your domain with one of these amazing babies. It works like a normal lock except it locks the entire world! Won't work on worlds that other people already have locks on. You can even add additional normal locks to give access to certain areas to friends. It's a perma-item, is never lost when destroyed. Recycles for 200 Gems"
If you have the recycle tool you can get 200 gems from recycling it, but if you don't have it, and trash it, you get no gems.