Pressure Gauge
Pressure Gauge is a homebrew Atari 2600 game written by John K. Harvey as a college exercise. It is a pure timing test with a single control: press the button at exactly the right moment. The idea came from a mini-game in the PlayStation title Brave Fencer Musashi. The graphics are just a few coloured bars, but it is the kind of game where you keep pressing Reset for one more try. You can play it here in your browser.