Game is for enjoyment & also for the entertainment for the children & as such it has been said that all work & no play make a jack dull boy . However while playing the game children should develop their skill & knowledge for interpreting the game where they have to find out the flag of different countries, Language of the different countries , popularity of game in different countries & their are certain game where student can help to get the knowledge in their spelling . Which this games like Scrabble, Sudoku , Hidden picture ,Capitals of countries , may help the student to learn the information which may certainly help & guide when they move on secondary & higher school.
Those games that at the same time that entertain them, make them think, create and apply those thoughts and creativity to continue playing and continue learning, giving feedback in a positive way to improve cognitive, affective and psychomotor abilities.
Solving jumble words increase the power of vocabulary.
Playing Soduku, crossword puzzle and Chess also good, improve their mental capability.
Apart from this as mentioned by Aparna PHYSICAL EXERCISE is more important. I strongly support this. Because of this human is always healthy without any complications. That's why the proverb 'Health is Wealth' always fit.