WOOGI1411

 WOOGI1411 (Formerly GW WOOGI1411) is a popular and skilled Korean Geometry Dash player/creator. He is known for making very hard levels, including the popular level Windy Landscape.

Some of the hardest levels on Geometry Dash, like Sequence and Colorful Overnight, are by WOOGI. He has also participated in many different mega-collaborations such as Phobos, The Hell Factory, A Bizarre Phantasm, and many more.

Levels

 * Windy Landscape
 * Colorful Overnight
 * WOOGI Jumper
 * Melody of Violins
 * WOOGI Fantasy
 * Sequence
 * Theory of WOOGI
 * Endorphin
 * Asymmetry
 * Complex
 * Retention

Trivia

 * On WOOGI1411's YouTube channel, all of his videos are "People & Blogs", and not in the "Gaming" category.
 * Some of his levels are just "layouts", or plain levels made from simple obstacles but quite challenging for the players.
 * Cyclic tends to put the tag "#RespectWOOGI" in the videos of his levels made by WOOGI. WOOGI, in return, tends to comment the tag "#RespectCyclic".