from the title page:
A Basic Fantasy Role-Playing Game Adventure Series
For 4 to 8 Player Characters, Levels 2 to 8
This adventure series from the World of Glain includes three distinct adventures, suitable for characters of various levels: Fortress of the Iron Duke, Tomb of Karsma Megalos, and Crooked Rock Tower.
This reflects the publication in its most stable form, post-playtesting, in print and electronic versions.