Use the mouse to move the on-screen pointer. Press and hold the left mouse button to draw circles.
Draw enclosed circles around groups of matching planets. The more planets you math, the more crystals you earn.
Collect crystals and bonus comets by touching them with the pointer. Crystals fill up the level quota bar.
Large matches of 4 or more will be rewarded with a x2 multiplier. Make a match with the multiplier included to activate it.
A mismatch of different planets will create a black hole. Destroy the black hole by drawing a circle around it.