This is a classic game of shuffling objects that everyone of you may have come across in real life. Well what better way than to introduce it to the kids in form of a ball hidden under a glass. This game is meant for kids aged four and above. It takes steady observation of the glass under which the ball is placed and it is not difficult to recognize it after shuffling.
The game's stated skill developments are observation, logic and mouse click. You can enjoy it yourself before you let your kids have a try. It is pretty easier and should not be difficult for kids to get to it. You can start playing this game on it's webpage on this link