A nice and peaceful game that will keep you entertained while stimulating your brain is Sort Fruits, a puzzle game in which you sort fruits according to their colors.
Move quickly and sort the different colored fruits that are in the tubes so that all of the fruits of the same color are placed in the same tube.
A mentality workout that is both difficult and relaxing all at the same time! Discover a ton of difficult levels and give your best shot at finishing them all! Best of luck!