From the product page: Zogorion Lord of the Hippogriffs is a micro-sized adventure written for the Swords & Wizardry rules (which means almost interchangeable with any Oe or Basic-style version of the original role playing game). The module features a detached card stock cover/map and a digest sized 16 page booklet published using old fashioned copy shop technologies and mailed to you (in the US) for the sub-break-even price of $2.00.