Hold the big BOOST pad to rise and let go to sink as the cave scrolls sideways. Collect gems, dodge stalactites, stalagmites and swooping bats, and survive the narrowest middle section. You have 3 hearts, and the cave is seeded so the daily and room runs match.
Metres flown, plus 10 per gem, plus an exit bonus with hearts left.
The daily and room runs use the same seeded cave.
You lose a heart, get a short invulnerable respawn in the passage centre, and keep flying.