Invade and conquer: Space Invaders thirty years on

In 1977 Tomohiro Nishikado, a 33-year-old Japanese computer programmer, was a company employee, like millions of others. In his spare time he played video table-tennis, manoeuvring white paddles up and down a black-and-white TV screen to return a white blob of a ball to his opponent. In the amusement arcades, he had noticed a new game called Breakout, which involved moving a paddle from side to side to hit a ball, in order to destroy a series of blocks at the top of the screen.