This is the first level of the M-Tunnel in Run 3. It branches off from Level 33 of the Main tunnel.
This level is an averagely difficult level. Beginners may not be 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.
You should use the Runner to play this level as she is more easy to use to navigate along the platforms, since the Skater is too fast, and the Lizard is only available only after Level 40.
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.