The subject of this article does not have an official name. The name currently in use is a fan designator. Please see below for more information.
The Unused Canyon Level is a cut level from Crash Twinsanity. This level would have been played in the Tenth Dimension and Crash and Cortex were going to use Cortex's Hoverboard to go through the level. This level would have been the only part of the entire game (and the series overall) where Cortex's hoverboard would be playable.
The concept art can be viewed in the game's concept art gallery. As shown, Crash and Cortex are being chased by Flying Swordfish enemies through a canyon in the Tenth Dimension in daytime. Flying Swordfish are cut enemies that were originally meant to be a Tenth Dimension version of the penguins that pursued them in Slip Slide Icecapades. The level later became Rockslide Rumble, which was the Tenth Dimension version of Slip Slide Icecapades and the Flying Swordfish were replaced with the ants.