Editing Game (section)

===Rules and aims===
Games are often characterized by their tools and rules. While rules are [[house rules|subject to variations and changes]], enough change in the rules usually results in a "new" game. For instance, [[baseball]] can be played with "real" baseballs or with [[wiffleball]]s. However, if the players decide to play with only three bases, they are arguably playing a different game. There are exceptions to this in that some games deliberately involve the changing of their own rules, but even then there are often immutable [[meta]]-rules.

Rules generally determine [[Turns, rounds and time-keeping systems in games|the time-keeping system]], the rights and responsibilities of the players, scoring techniques, preset boundaries, and each player's goals. 

The rules of a game may be distinguished from its aims.<ref>{{Cite journal |last=Schwyzer |first=Hubert |date=October 1969 |title=Rules and Practices |journal=The Philosophical Review |volume=78 |issue=4 |pages=451–467 |doi=10.2307/2184198 |issn=0031-8108 |jstor=2184198}}</ref><ref name=":0" /> For most competitive games, the ''ultimate'' aim is winning: in this sense, checkmate is the aim of chess.<ref>{{Cite journal |last=Kemp |first=Gary |date=2007 |title=Assertion as a practice |journal=Truth and Speech Acts: Studies in the Philosophy of Language}}</ref> Common win conditions are being first to amass a certain quota of points or tokens (as in [[Settlers of Catan]]), having the greatest number of tokens at the end of the game (as in [[Monopoly (game)|Monopoly]]), or some relationship of one's game tokens to those of one's opponent (as in chess's [[checkmate]]). There may also be ''intermediate'' aims, which are tasks that move a player toward winning. For instance, an intermediate aim in football is to score goals, because scoring goals will increase one's likelihood of winning the game, but isn't alone sufficient to win the game.

An aim identifies a [[Sufficient Condition|sufficient condition]] for successful action, whereas the rule identifies a [[necessary condition]] for permissible action.<ref name=":0">{{Cite journal |last=Marsili |first=Neri |date=12 June 2018 |title=Truth and assertion: rules versus aims |url=http://eprints.whiterose.ac.uk/127177/7/MARTAA-35v1.pdf |journal=Analysis |volume=78 |issue=4 |pages=638–648 |doi=10.1093/analys/any008 |issn=0003-2638}}</ref> For example, the aim of chess is to checkmate, but although it is expected that players will ''try'' to checkmate each other, it is not a rule of chess that a player ''must'' checkmate the other player whenever possible. Similarly, it is not a rule of [[football]] that a player must score a goal on a penalty; while it is expected the player will try, it is not required. While meeting the aims often requires a certain degree of skill and (in some cases) luck, following the rules of a game merely requires knowledge of the rules and some careful attempt to follow them; it rarely (if ever) requires luck or demanding skills.