Tetris, the beloved (and epic) puzzle game, turns 25 years old today. In 1984, Russian mathematician Alexey Pajitnov was playing with one of his favorite puzzles when he had an inspiration: How about creating a computer version?
Pajitnov wrote the program in his spare time, simplifying the idea to make it easier for those of us who aren't math geniuses. He used shapes made of four squares -- hence "Tetris," which comes from "tetra," the Greek word for "four."
In the game, players must position and stack blocky shapes to fill a grid without leaving spaces in between. Successfully completed sections disappear. The more sections the player completes without reaching the top, the better the score.
To date, Tetris has sold 125 million copies. You read that right.
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