Omg, where am I?! What year is it?! I clicked on this link and now it’s 2 hours later! 
I think I was playing Tetris…
Play Tetris in Mozilla! MozTris is an implementation of Tetris using Javascript, HTML 4.0, CSS, and the Mozilla DOM. It also makes use of the PNG format for various images. If you use Opera, you can also play MozTris!