If you have never played the excellent title Monument Valley from USTWO Games, now is the time to give it a try. The Amazon App Store has Monument Valley as the Free App of the Day. This deal only lasts 24 hours, so get it while you can. Monument Valley has received excellent reviews, and it is a beautifully rendered 3D puzzle game. The game currently costs $3.99 in the Play Store. The expansion to Monument Valley “Forgotten Shores,” has been released on iOS and it should make its way to Android soon.