I'm having a lot of issues getting this game to work, but in order to play it you need to download the dropbox folder and then manually set the java security settings to allow the applet to run. Hopefully it should work then. Make sure to restart the browser in order for the settings to update.

The aim of the game is to protect your white (what would be a crystal if I could put images in it) thing. Zap the red boxes with the left mouse button; hold right mouse button to laser the blue boxes.