One tap moves both. The cyan orb falls, the gold orb floats — keep them both alive at once.
Two orbs share one control. The cyan orb on the left obeys normal gravity and falls unless you flap, which pushes it up. The gold orb on the right is mirrored — it drifts upward on its own, and the same flap pushes it down instead. Both sides scroll toward gaps at the same time, so a single tap needs to help whichever orb needs it more without ruining the other's position.
Because the two orbs react oppositely to the exact same input, you can't fix both at once — tapping to save the cyan orb from the floor pushes the gold orb further down too. The skill is in reading both lanes ahead of time and tapping in a rhythm that keeps each orb close enough to safe when its gap arrives.