Instructions: - Choose any colored piece from the right,
- Press and release the left mouse button,
- Move the piece there you want,
- Left click again to release piece. :)
While you dragging piece, you can rotate it by mouse wheel or a Space key.
Good luck!
<a href="http://www.funpuzzlesgames.eu/index.php?og=Side+Effect%3E%3E%3E%3E850ed91300aaa9bd&ogc=Puzzles" target="_blank">Side Effect</a>