There are five balls hidden somewhere in the black tiles. The object of the game is to find them. You mark them with blue balls based on clues that are revealed when you click the red tiles. The clues are as follows:

• H - A direct Hit. Imagine a ray radiating directly from the red tile into the black tiles and eventually hit one of the hidden balls. Note that it may have been reflected into one.
• R - Reflection - The ray was either reflected by a circle directly diagonal to the red tile, or its path came to a space with two balls in each of the diagonal squares in the path and was reflected back.
• # - A number represents a starting point and an ending point for the ray. It could pass straight through without hitting anything or it could run into a ball diagonal in its path and be deflected 90 degrees opposite the hidden ball.

When you've placed your five ball guesses, either a red circle appears in the upper left hand corner designating that one or more of your guesses are incorrect, or a green cirle appears meaning you've all the ball locations correctly. You can also click the red circle if you give up and want to know the answer. If you do this, it will turn your wrong guesses red and turn the ones you missed green.