From breakthrough hardware to time-honored software, PC World salutes those amazing products that changed technology--and our lives--forever.
"10. Tetris (1985)
In the beginning, the goal in most video games was to shoot aliens, race through a maze, or beat up thugs. None of the games required much thought, just a deft hand on the joystick and a pocketful of quarters. Alexey Pajitnov's independently developed Tetris was one of the first games that required actual use of your brain, and it shook up the gaming industry in profound ways.
Pajitnov's game of falling bricks was simple enough to grasp, yet challenging enough to offer endless replay value. Tetris became a hit on a number of platforms, from PC to Mac to Game Boy (in fact, many Game Boy buyers reportedly purchased the device solely to play Tetris). Despite being more than 20 years old, Tetris continues to inspire new variations and knockoffs, demonstrating that a game doesn't need amazing graphics and involved storylines to get people hooked."