Color Merge comes from ImpactBlue Studios. The object is to merge all the colors so the entire board ends up being 1 color which is specified at the top of the screen.
Look at the first image. Near the top you'll see a small green dot in between the blue & yellow circles. That means, first, that the circles can merge and second, that they will merge into green.
Seems kind of obvious except that red & yellow can never merge. It took me a while to figure the pattern out. At the top are the 5 circles. A color cannot merge with its neighbors. But when it merges with the other 2 colors, the result will be the color in between.
For example: purple cannot merge with blue or red. When it merges with yellow, the result will be red. Not very intuitive. When purple merges with green, it will become blue.
Color Merge is a serious puzzle concept. At the moment I've solved 18 levels. I'll do more, but definitely not more than 50.