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Jax is a very famous Korean player and level creator in Geometry Dash. Jax made many demons, most of which made it into demon map packs, and the first ever Auto level. Jax also made The Nightmare, one of the first and liked Demon level.
The Nightmare (Most liked/popular demon, Demon pack #3)
Project J (Demon with many dislikes)
Auto play area (First & Most liked/popular auto level)