Feelie

Infocom used the term feelie to refer to the extra content included with the boxed versions of their interactive fiction computer games. Feelies differed from game to game and were of the same theme as the game they came packaged with. For example, Wishbringer, a fantasy game with magic, came with a "Magick glowing stone." These extra objects and documents sometimes served as a form of copy protection, as several games were impossible to solve without information found in their feelies.