Is Choose Your Own Adventure copyrighted?

'Choose Your Own Adventure' is a registered trademark, owned by Chooseco LLC, so you cannot use that exact phrase as the title or branding of your own game or book. The general concept of a branching, choice-based story is not protected, though: anyone can write and sell interactive stories where readers pick what happens next. That is why you see the same format described as a gamebook, interactive fiction, or a branching narrative rather than by the trademarked name. If you are making your own, just avoid marketing it as a 'Choose Your Own Adventure' product and you are on safe ground. Call it a branching story or a gamebook instead, and build it however you like, for example in a visual builder.