Would it be legal to write a advantage/disadvantage mechanic

[JenniferRPG]

.. supplement for BFRPG? (Not that it is necessarily needed, but I have noticed others here mentioning that they use it in BFRPG.)

[chiisu81]

A unique implementation you come up with? Yes
One that gets too close to 5E? No

[Dimirag]

AFAIK that mechanic is not copyrighted so I think you can, I've seen several games published that used that mechanic way before 5Ed.

Just remember to not copy any text direct from a copyrighted source.

Also, this belong to GD

[JenniferRPG]

AFAIK that mechanic is not copyrighted so I think you can, I've seen several games published that used that mechanic way before 5Ed.

Just curious, which games have you seen the advantage/disadvantage mechanic in before 5e?

[Solomoriah]

Advantages and disadvantages were part of the HERO system (Champions etc.) as well as Villains & Vigilantes, and I think GURPS has something like that also.

On another subject... this thread does not contain actual game materials, but is a discussion thread, so I must boot it to General Discussion. Please remember, all posts in the Workshop must include actual game materials or a link to such which can be downloaded for free from another site.

[Dimirag]

One was Goblins & Grutas, a spanish rpg, it was presented as an option way before 5e started with its playtest.
I can't remember the names of the others. I know there is an spanish system that uses 3d10 for a roll, and you use the middle value, depending on some advantages and disadvantages you have to use either the higher or lower value.

[Vile]

There is no way to protect the mechanic of "roll two dice and pick the highest/lowest". If you want to be super-safe, call it something other than advantage/disadvantage (a thesaurus is a wonderful thing for clone writers).

[Delver]

I use Advantage and Disadvantage in my games as a house rule. In fact, I pull stuff from several different versions of a certain game. Is a supplement necessary? Probably not, but it would still be cool. Call it something different if you need to, but go for it!