Can't Let Go is much harder than the first five levels, and since it's marked Insane, one would expect more of a challenge. Hard jumps and numerous traps lay throughout this level, making it live up to its Insane difficulty label.
The same applies with the third coin, but it is harder to get to.File:Geometry Dash Can't Let Go.jpgCan't Let Go is the first Insane level, as Base After Base is Harder.
This level may take days or even weeks to beat on normal mode.