Fidelity of games as a concept describes the level of representation of, or accordance with reality. The level of fidelity has influence on the interaction between player and game. Our study discusses the outcomes of a literature study and three cases with the goal to propose a comprehensive framework of game fidelity. This framework could help game designers and researchers to adopt the ‘right’ or sufficient level of fidelity to achieve the intended objectives related to applied games. Our results show that functional and psychological fidelity have a higher impact on the experience and effects of applied games than their physical fidelity. Social and ethical fidelity are proposed as new dimensions of game fidelity that still have to be explored. In literature, both low and high levels of fidelity are described as effective in applied games, while a medium level seems not to be beneficial for the player.