Keyboards have more than 100 keys, but there are four that are most important to people who play video games: W, A, S, and D. There are games that use more than these keys, yes--StarCraft, League of Legends, and World of Warcraft use all sorts of combinations--but the majority of games rely on a small sampling of numbers and letters on the keyboard. There are practical reasons for this, to be sure: Computer games often require one hand on a mouse, the other on a keyboard. There are a ton of...
