I just noticed we have two tags which are pretty similar:
Use this tag when asking about the target numbers rolls are trying to achieve, in systems which call them "difficulties." (d20 System questions should be tagged [difficulty-class].)
Use this tag when asking about the target numbers rolls are trying to achieve, in systems which calls that the "difficulty class."
They seem to be basically the same concept, except that it instructs us to use a very slightly different name for systems which give that same fundamental concept a very slightly different name. I consider it noteworthy that the [difficulty] has five questions tagged D&D 5e against instruction.
Should we make these tags synonyms, or keep them separate (and maybe do some retagging)?