Solo

A solo role-playing game is one that is played by only one player, without even a GM. Although it is possible to play some games designed for group play as solos by using a GM emulator, the term is more often used of games that are designed to be played by only one person, such as Quill.

Although games with a GM and one other player are sometimes referred to as solos, these are more accurately called duets, duals, dyads, or simply 2-player games.