Forbidden Gateway
Horror (Supernatural) Action / Adventure
Dice (Primarily d6) GM-less (No gamemaster needed to play) Random Attribute Generation (during Character Creation) Reading (for Periodicals, Adventure Books, etc)
Forbidden Gateway is a series of two single-player fantasy choose-your-own-adventure gamebooks. These gamebooks tell an horror stories in the vein of H. P. Lovecraft.
The series have been created back in 1985 and seems to have stop right after the second book, since there is no trace of a third book. Also, the two books feature a connected storyline, and characters could be carried from the first to the second book.
