Constellation
Constellation is a small, sharp idea: a secret drawing assembles itself out of points of light, one star at a time, and you’re trying to name the picture before it finishes forming. Guess too early and you might miss it. Guess wrong and the reveal speeds up, which makes the next star arrive before you’re ready.
You get two hints and three misses before the run ends. Copy your score when you’re done and see if a friend can beat it, or catch the same picture faster than you did.
It’s the kind of game I wanted for the two minutes between meetings. Something with a real puzzle in it, over before it overstays its welcome.