NOTE:  This game uses the doubles plus one more strategy.  The questions go beyond 6+6, so this might be a game you want to play with your child, instead of having them play independently.  You could write a list of the doubles number sentences up to 10 + 10 for them.  Try to include your child in creating the list.  Ask them questions about why they think their idea is the answer.  Then they can use this as their "cheat sheet" for the game.