ABSTRACT
A goal is a global constraint that allows us to distinguish good moves from bad. There are three implicit goals that players bring to every game: coherence, expansion, and closure. Players themselves bring implicit goals to every game they play. Coherence play emerges from choosing moves according to how they affect a particular set of privileged internal constraints. These privileged constraints constitute a role—a way of being within the game that takes precedence over all other considerations. Just as with coherence play, expansion play obeys the heuristics. Even though players are working to maximize our choices, the game should still prevent them from reaching situations where the number of possible moves becomes too large for them to handle. Closure is directed toward "accounting for everything" and is the primary motivation behind collecting, cataloging, and tying up loose ends.
