This is level 4 of the A-Tunnel.
First of all, take ONE look at the picture. What do you notice? That the rest of the level is like that. Normal tiles, crumbling tiles, normal, crumbling. So using the Child, you don't even have to move and it's an instant win. If you don't have the Child(go back and get him), use the Runner. With her, you can try and avoid the big chain of crumbling tiles.
If you are using the Runner, try to avoid the crumbling tiles. If one of them crumbles, the rest crumble as well, increasing the difficulty of the level quickly.
As for the Pastafarian, try to walk on the light bridge most of the time. Avoid the crumbling tiles since she is most vulnerable to them.