Simple but very absorbing puzzle!
A large number of people have played it since it appeared on GameSaien.com.
Mini: 100 tiles (iPhone & iPad)
HD: 200 tiles (iPad)
Gameplay
Tap on a blank space. If the color matches the nearest neighboring tiles, vertically or horizontally, from the tapped space, you get the matching tiles.
If you have color blindness, please try the color-blind mode in the setting screen.