Toxic Tunnels

Toxic Tunnels (どくヘドロ トンネル lit. Sewage Sludge Tunnel in Japanese) is the second story level of Cortex Island (1996) and the thirty-second main level of Crash Bandicoot 4: It's About Time.

Overview
Just like in Nitro Processing, Crash/Coco has to go through wall-running sections. If Crash/Coco has collected all of the colored gems, he/she will be able to complete the multicolor gem path. At the end of the level, Crash/Coco comes inside of Cortex Castle.

Trivia

 * This level has similarities with Spaced Out from Crash Bandicoot 2: Cortex Strikes Back and Bug Lite from Crash Bandicoot: Warped:
 * They all have multicolor gem routes, which for all colored gems of the game are needed.
 * All of them have a clear gem at the end of a multicolor gem route.
 * In all of them, the final gem path of the multicolor route is much simpler than the other gem paths of the route.
 * But unlike Spaced Out and Bug Lite, which are the last levels of their respective games, Toxic Tunnels is not the last level of Crash Bandicoot 4: It's About Time. Other significant differences from Spaced Out and Bug Lite are that the multicolor gem route in Toxic Tunnels is required for the box gem, all colored gems are required to enter any part of the multicolor route, and the multicolor route does not lead to an exit for the level.