To start the game, click the left board or click the green ball in the top center. Coloured balls will drop randomly on the left board.
Click three ball which are placed like the ones given on the right board. They don't have to be of same colour. The triple of balls will then disappear.
When you think you eliminated all such configurations, click an empty position on the board or clock the ball in the center column. The program will tell you whether you found them all (win-message) or whether you didn't (Loss-message). If you lose, three silver balls show you a configuration you missed.

The variants use different configuration which have to be eliminated.
Note that there are several alternative piece sets and boards available.

Related game: Jumbled.

More freeware as well as real puzzle and games see my homepage: http://karl.kiwi.gen.nz/.