Examples:
Game is widely perceived as free but isn't.
Game or game content is freely copyable and officially sold as a download or in retail outlets.
Code is freely copyable and game or game content is officially sold as download or in retail outlets.
Code is freely copyable but online activation is required before the game or game content will run (note, this feature can easily and legally removed from the code and the game compiled)
Game engine/code is freely copyable and content is proprietary.
Content is freely copyable and game engine/code is proprietary.
Game or game content is fully public domain yet notably being sold.
Game or game content is sold commercially while being designed to be used in conjunture with a primarily non-proprietary or non-commercial platform or collection of software.