From Emanuele Feronato: "Did you play Memdot by Appsolute Games, the same team behind Dashy Panda game I already explained?
It’s a tiny free iOSgame which has been featured on the app store. Some colored circles enter the stage in a fancy way. The the stage fades out to a random color and circles disappear. You have to touch all circles with the same color as stage color.
Easier to play than to explain, as usual.
This game is also perfect to start a new tutorial series, we will see how to create the engine which manages circles entering the stage, background color fading in, and you selecting the circle (or the circles) matching background color."