During the 1960s and into the early 1970's, the 3M company produced a series of games aimed at an adult audience. These games were in general very well done, with fairly simple rules but complex gameplay and depth and with uniformly high quality components. The games covered a variety of topics, from business and sports simulations to word and abstract strategy games. They produced their games in several formats: the "bookshelf" line, a smaller line of mostly card games known as the "gamette" line, and a sports game line which consisted of a vinyl playing board which wrapped around the box holding the game components.