The design of the learning interactions within a game, which are referred to as learning mechanics (Plass & Homer,), is the process of mapping learning objec-tives onto instructional strategies that are based on appro-priate learning theories (Homer & Plass,) The Handbook offers an indispensable reference both for readers with practical interests in designing or selecting effective game-based learning environments and for scholars who conduct or evaluate research in the field. Distinguish betwee