Ever spent an entire day locked up in the house playing Tetris? Far too many of us can answer 'yes' to that question.

Tetris, that block-building game that is the king of time wasters and the bane of productivity specialists, celebrated its 25th anniversary on Saturday. And if 25 years isn't proof that Tetris is firmly embedded in our collective psyche, look no further than the ton of sites that celebrate the simple yet addictive game:

• The official Tetris site
• Human Tetris
• Tetris Party for Wii
• Tetris - The movie (fake movie trailer)
• Tetris furniture design
• Tetris soap
• Tetris Weightlifting

And if you just can't get enough Tetris on your home computer (or iPhone, or Android or Blackberry), play it old school-style. Classic arcade games can be found at Joystix, Dave & Busters and arcades throughout the city.