There is Survival, Creative, Adventure, and Debug mode. Debug mode is a world with no floor and has every single block and feature in that world placed in the sky. You spawn in creative in debug mode. Debug mode is supposedly a place where Mojang keeps all their data on their blocks and features.
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200 Facts About Minecraft
FanfictionA bunch of uncommon and helpful Minecraft facts most people don't know about... (The Secrets Handbook) Also, make sure you check out my latest book, Minecraft Origins- The Revival, the first book in my Minecraft Origins Trilogy.