Click the board to let Zillions randomize the setup. Twentyfive colour 'cards' will appear, each showing 25 colours.
Click the two cards which are the same.
After having clicked one card, you can click it again to unselect it.

Hidden somewhere on the board are some hints which help you find the solutions, but enough said.... ;-)

Variant 2: 16 cards with 16 colours each (easier).
Variant 3: 9 cards with 9 colours each (easiest).

Please note that there are alternative piece sets available.