Nyetris
A puzzle game like Sokoban where you push shapes into 5 in a row. It's not Tetris.
This website will always have the latest version of Nyetris. Use this instead of the old links to have an up to date game. Another cool thing is that all versions DEMOv1.5 and up will have a link at the bottom of the page that will take you here so you can see if the version you're using is up to date and if not, where to find the up to date one.
I don't know what to say except play the game. There's a button right there ok?