This is the first level of the M-Tunnel in Run 3.
This level is an averagely difficult level. Beginners may not be able to handle it easily, but after you play the Level 1 to Level 33 of the Main Tunnel, you should be able to handle this level easily.
This level is easiest with the Runner, as she is easy to use to navigate along the platforms, and the Child, as he can stand on crumbling tiles without them crumbling unless you jump.
You don't have to try your best to avoid the crumbling tiles, just try to avoid as much as you can. If you accidentally knock over a crumbling tile, don't worry. Just jump between platforms and you won't jump into the void of the space.