This is level 39 of the Main tunnel.
This level may trouble beginners, and the Runner helps to plan ahead for the next jump. Beating this requires a good amount of lookahead. The abundance of crumbling tiles makes this level hard, and try to avoid them at all costs (except of dying, of course). Tips: Jump high with the Runner and look for a landing place. Repeat and repeat. Try to finish the level in midair. If the situation is not good, try landing on a wall. This may come well.