The line runs east to west and the bird flies across it. Hold the phone in landscape and the flight resumes where it left off.
Collect message capsules from the air and carry them home — through a stone dovecote's flight hole, or over the roof cages of a mobile loft on the road below.
Every capsule is weight: the climb weakens, the sink steepens. The weight bar is also your score multiplier — an empty pouch earns nothing, a full one multiplies by three. Distance flown while carrying is banked when you reach a loft, and lost with the bird if you go down.