Children love to play games. Parents and teachers can incorporate this love for games into a learning experience. Children won't even realize they are playing educational games, they will just be focused on how much fun they are having.
Probably the most important developmental benefit is that all of these games require that children interact and speak with each other. They have to negotiate rules, take turns, correct and challenge each other. Thus they are thinking and problem solving all the time. They can improve their listening and speaking skills. They also have to deal with the emotional consequences of these interactions: handling loss, helping a friend to handle a loss, being a gracious winner and taking turns.