Underplane is a game you play by standing still. It reads live aircraft data, works out which planes will actually pass over you, and scores every catch on how close it came.
Download on theApp Store
Scoring
Every catch is graded on how near the aircraft's path came to where you actually stood. There is no skill in the phone and none in the sky — the only move you have is choosing where to be, and that is the entire game.
Fourteen achievements sit behind the grades — including Dead Reckoning, for five catches inside ten metres.
How it works
Live ADS-B positions around you, with every aircraft's track projected forward — including a turn it has lined up but hasn't flown yet.
Anything whose path enters your catch radius becomes catchable. You set that radius yourself, anywhere from 500 m to 15 km.
A countdown to the second it passes, on your lock screen. Most of the time the answer is to stay exactly where you are — and the catch scores itself.