Earendel

Even if you know the mash path in the second half, it's still quite difficult.

Just be careful with the crossover, hit the final bracket well, and make sure you don't get cut on the final hold...

While other run songs can be pushed through with good/bad, this one requires a larger stride, making it easy to just drop one or two notes. Even if you feel like you're mostly keeping up, your gauge drops surprisingly fast. The final hold can be mashed, and if you memorize the foot placement for the bracket, it's manageable.

it's not that hard

Locals need to identify the mash path in advance and hit it accurately. That path is quite unique.