No "right click" possible

my imac does not have right and left parts to the mouse - it is just one solid mouse. in other games i have been able to use the space bar to rotate puzzle pieces. that doesn't work with this one. does anyone know how to rotate puzzle pieces without "right click"? thanks.

you've probably figured it out by now, but hold the control key down when you click.

Yeah. herisf is right. You can use control key while moving your click.