Answer and Explanation:
According to the question the contract is valid but the same would not be enforceable as Amanda is a minor. As a minor her consent is not valid completely but if there is any violation on Games Galore so the same would be penalized that results the contract to be enforceable. For minors, the guardian is necessary
So being a minor the contract would not be enforceable although she accepts the terms and condition of 18 months