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Ranger REG said:I think you can get away with the words "3.5 Compatible" as long you do not further explain what that means, anywhere in your Covered Product. I just have a problem with using it to cite reference from their book like say, "See the Combat Chapter of the 3.5 Rulebook I," and using it often. A d20 gamer-consumer may be able to make the cryptic meaning, but other gamer-consumers may not, or will be scared off from purchasing it because it means you need another book to make your product playable.
Ah, I see. Yes, I think you've got a valid point if the subject at hand is a stand-alone game, such as the one this thread is about. (Or is supposed to be about, until I keep hijacking it.

But again, I'd suggest that a campaign setting or supplement that's not intended to stand alone can get away with far more of that sort of thing. After all, the people buying it already own the books, so they're not going to be scared off.
That said, were I (or anyone) to publish an OGL, but not D20, product intended as a D&D supplement, I'd advocate simply reprinting rules when necessary (i.e. reprinting the heat danger rules, rather than referencing the environment chapter of "Core Book II"). Obviously, you can't do that if you're referencing page after page, but for the occasional referent, it should be doable without reprinting so much that you're wasting space. True, you can't do that with character creation or advancement rules, but then, you can't do that with D20 either.