What is the HARDEST DUAL in Geometry Dash?

Geometry Dash introduced the dual gamemode in 1.8. Since then, people have only gotten better and levels have gotten harder. Today, we're going to look at the hardest duals in levels in Geometry Dash.
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Credits
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Music
Sappheiros - "Perspective": https://open.spotify.com/track/0R2wma...
Solkreig - "Phobos":    • Solkrieg - Phobos [Geometry Dash]  
Dole Damos song:    • Club Donnie Thornberry | Dole Damos S...  
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Gameplay
Grey749:    / @grey7498  
Nexus:    / @nexusgd10  
Kapinapi:    / gdkapinapi  
Spaceuk:    / Канал  
fnm04:    / fnm04  
Stormy/Stormfly:    / @stormfly  
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Special Thanks to:
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clncrvl
Ender
MatMart
Wave
ClayFuzzy
Waboo
Echo
GeoNetwork server
Hmm Official server
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