How to Play: War
How to play: The deck is divided evenly among the two players, giving each a face-down stack. In unison, each player reveals the top card on his or her stack, and the player with the higher card takes both the cards played and moves them to the bottom of his or her stack.
The rules: If the two cards played are of equal value, each player lays down three face-down cards and a fourth card face up, and the higher-valued card wins all of the cards on the table, which are then added to the bottom of the player's stack. In the case of another tie, the war process is repeated until there is no tie.
How to win: You win by collecting all of the cards.
What else you need to know: If a player runs out of cards while dealing the face-down cards of a tie, he or she may play the last card in his deck as his or her face-up card and still have a chance to stay in the game.
Related: More Kids' Games
Start by teaching him that it is safe to do so.