Old-School Essentials (OSE) is a legendary fantasy RPG in PDF format that brings you the best of classic tabletop role-playing games. It is based on the Dungeons & Dragons family and is fully compatible with the 1981 Basic/Expert D&D rules – yes, the famous "red box" that inspired the cult classic Dračí doupě.

This rulebook streamlines and clarifies the rules, making them easy to grasp even for complete beginners while preserving that classic old-school atmosphere. The PDF version allows for instant use and easy access to supplements and fascinating adventures, which is why OSE remains a favorite among players of all generations.