This is level 37 of the Main Tunnel.
With the Runner, stay on the yellow and jump if required. Remember that the Runner has high maneuverability on the ground. Try to follow the platforms, and avoid the crumbling tiles.
Alternatively, the Child can coast along the crumbling tiles that form much of the stage.
Overall, this level has a rather narrow range of characters suitable, but is still quite easy with the right characters.