A dream where you are playing a game can symbolize how you are progressing in the game of life. To do well in a game suggests that you are doing well in some part of your life, whereas to do badly implies you need to approach something in your life from a different angle or in a different way.
The dream can also suggest that you are having feelings or aggression towards others or another person, or that you are putting a lot of pressure on yourself in some part of your life.