Playability is the basic necessities that a game must have in order to be a game. Fabricatore categorized pliability into entities, scenarios, and goals. (Fabricatore, Nussbaum, & Rosas, 2002) Entities are every object with the game that the player can interact with, or the player himself. Scenarios are the hazards that a player may face. Goals are the reasons the player is playing the game. The following diagram subcategorizes these points even further. If entities, scenarios, or goals are not included in a game, a game is not playable. The subgroups of each of these groups do not have to be included, but are useful in seeing what each of these categories consist of.