Pinnacle is an adventure with rules for climbing and investigation. Part of the Role Aids line of Advanced Dungeons & Dragons-compatible products, and intended for 4–6 characters of 4th to 5th level. From the publisher's website:

In this 32-page adventure, the characters race to be the first to stand atop the tallest mountain. New monsters and systems for investigation and mountain climbing are included. For 4-6 characters of skill levels 4 to 5.