Click on the colors in the given order. If a color is clicked, it's glowing and can't used again.
Start with blue, followed by yellow, green, magenta and red. Then it starts again with blue.
The special thing is, the next color has to be in the same row or column and is max 2 fields
away from the last color. That means you can jump over another field (for example step 1 to 2, 5 to 6 or 8 to 9), or you have to use the colored field next to the last color.
If every field is glowing you've finished the level.
Good luck and have fun!
P.S. There is a helpfunction, if you hit 5 times restart on the same puzzle, you can let you show the first stone. this makes it a lot easier to solve :)