A strange little side quest
Even a quick game like Sift Heads World Act sits on top of decades — and sometimes centuries — of ideas. Doom changed game design and distribution in 1993 by separating its engine from content and spreading widely through shareware. The broader history adds one more wrinkle. Midway's Gun Fight from 1975 was the first arcade video game to use a microprocessor. That long chain of experiments is part of why action games still feels fresh when a game finds the right twist.