While playing game use (click on the applet first) JKL or 789 to move droping piece around, SPACE to drop, S to start new game and P to take a coffe break. You can also zoom in/out with E and R keys and speed up game with Y.

If you are interested you can check out sources - BlueBlox.java.

Original idea is stolen from a DOS game Beyond Colums I lost long time ago. If anybody knows who is the author, or has some questions / sugestions / comments, please e-mail me.