I love this detail about ‘Space Invaders’:

The technological limitations of the day were also responsible for a key gameplay component of Space Invaders—shooting enemies caused the remainder to move faster. ‘At the start of the game, it takes about a second for all the invaders to take a step. As their number decreases, the time to draw them all becomes shorter, and so their speed of movement increases.’

Rian van der Merwe Elezea // The B-Sides