The obSESSION RPG Meta-System.

obSESSIVE Compatability

Compatability is a major issue with obSESSION. Because the system is designed around the concept of internal consistency it becomes important that the game's rules adhere to that consistency and remain cross-compatible.
In theory any Character from any obSESSION Game could be transferred to any other game with no compatability issues.
In practice, of course, this is harder to arrange than it sounds. The way that we have chosen to handle it is through the application of oC and NoC designations to any game using the obSESSION Core. These are very simple:

A game is either 100% obSESSION Compatible, using no variant or unusual rules that could affect cross-compatability (an oC game);

Or the game uses the Core obSESSION rules but introduces variants or new rules that are not necessarily completely compatible with other games (a NoC game).

These designations are voluntary and are assigned by the game's creator, whether the company publishing a comercial game or the GM designing a new game for his own group. In order to avoid confusion and disappointment you should always assume a NoC rating for any game that does not specify and should always assign a NoC rating to your own game if you are not sure that it is 100% compatible.

The graphics found below are designed to provide an easy, at-a-glance, way of identifying a product as 100% oC or not. The obSESSION style d10 graphic to the left indicates a NoC product, something built with the obSESSION Core, while the one on the right denotes a oC product by adding the letter C in the appropriate font. Feel free to save these images for use on your own obSESSION projects.


Compatability in obSESSION is achieved through more than simply keeping the same rules from game to game. In order to allow those rules to operate in as many situations as possible each has been carefully constructed by building upon certain key core concepts and any rule which does not adhere to that building process has been dismissed. Extensive testing, often "plugging in" extreme situations to determine a rule's applicability has accompanied the creation of every key rule in the obSESSION system and, where something didn't work, the necessary reconstruction has happened at the lowest possible level in order to ensure maximum compatability.
obSESSION is designed to perform any task, for any genre, without breaking any of the other rules of the games and the result is a system that is almost infintely expandable without breaking compatability. We aren't claiming that the game is superior to other games out there, but it is more versatile than any of the 100+ systems studied in the course of it's long design.