Editing RPG Lexica:MNO (section)

==O==
;OGL, Open Gaming License: A general purpose gaming license which was originally written by [[Wizards of the Coast]], which allows reuse of parts of games published under it in a similar manner as open source software.  OGL is somewhat controversial in its use of "product identity," especially when the publisher makes little or no effort to mark out what content is open and what content is closed.


;OGL Heartbreaker:  A game which, although it has an original world, uses an open-licensed gaming system or variation thereof instead of a system that is unique to that game world.  Typically called a "Heartbreaker" because either the system used proves to be a poor means for conveying the intended feel of the setting, or it has no hope of finding a niche in the market because the generic system chosen already has a market leading game in the same genre. 


;One Roll Engine:  A unique [[dice]] system designed by Greg Stolze and used in the game ''[[Godlike]]''.  Rather than trying to match a particular target number, the player rolls a number of dice based on their [[character]]'s competence and are deemed to have succeeded if two or more of those dice roll the same value.  The unique property of this system is that a single roll delivers ''two'' results: the number of dice that matched, and the value they matched on.  
:Note: the author claims this system is copyrighted, but U.S. law explicitly states that the rules and methods of playing a game are not copyrightable (http://www.copyright.gov/fls/fl108.html).


;One True:  A sarcastic term used to imply that a particular system, rule, or principle is being advocated above all others, as in "the One True System" or "the One True Way".  A great example of this can be found on ENWorld with the user named Diaglo who regularly asserts that OD&D is the "One true game, and all others are pale imitations."


;Open-ended roll:  Any [[dice]] rolling system which includes the rule that any dice which rolls its maximum result should be rolled again, with the new roll added to the previous one to determine the final result.  For example, if a 5 is rolled on an open-ended d6, the result is 5; but if a 6 is rolled, the dice is rolled again, and if a 4 is rolled on the second roll the overall result is 10 (the 4 just rolled plus the 6 rolled previously).  
:Open-ended rolling has the unusual effect that certain die results are impossible to attain -- in the above example, a result of 6 on a single die can't happen.
:See also: '''Exploding Dice'''


;Ouija board gaming:  Any form of gaming in which the players have a strong expectation and desire for what they want out of the game, but refuse to take direct action to obtain it in the belief that it should "arise naturally" from other play.  A classic example is players who want engaging and heroic stories but actually play highly gamist systems, many of which actually penalize heroic play, in the hope that a engaging or heroic plot points will arise by chance as a result of the operation of the standard gamist rules (for example, a PC attempting a valuable task they have little chance of succeeding on and getting a lucky roll - the problem being that most of the time, the PC will not get a lucky roll and the valuable task will fail, hurting the developing plot).  The term was coined by Ron Edwards as an analogy to the boards supposedly used by mediums to contact spirits, where all participants in a session want the glass to move (so that there's a point to the session) but none want to move it (because doing so would confound the idea that the glass is being moved by supernatural forces).


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[[Category:Terminology]]