To dream of a game show represents an experience you are having in your life where you are taking chances, or making guesses. Trying to change your life taking a chance or doing one thing different.
To win at a game show represents feelings of gained power or luck with big a chance you took doing something different.
To lose at reflects feelings of not having the perfect idea or opportunity to change your life. Feeling that something else is needed from you in order to get the change you wanted. Bad choices, bad luck, or lost opportunities.
Consider the name, theme, or prizes used in the show for additional symbolism and how they may be relative to your waking life