Timemaster is a role-playing game (RPG) featuring a time-travel system in which the player characters are agents of the Time Corps, an agency based in the year 7192 that is dedicated to preventing enemies from changing history.

[3] The main antagonists are an evil alien race called the Demoreans, who have also mastered time travel and are intent on changing history to eliminate their enemies.

[4] Although Pacesetter was short-lived, it produced several role-playing games within a one-year period, all based around the same house system of rules, with the first three being Chill, Star Ace, and Timemaster.

[5]: 197 Timemaster, published by Pacesetter in 1984, was designed by Mark Acres, Garry Spiegle, Andria Hayday, Carl Smith, and Gali Sanchez, with cover art by Jim Holloway.

Norledge concluded by giving it an overall rating of 7 out of 10, saying, "It is eminently suited to the 'one-off' style of play, and, yet, with effort, would also be a good campaign game (though it would have a very episodic feel to it).

It's got a fairly interesting unifying theme; the game does an excellent job of making time travel seem plausible, and the "Guide to the Continuum" is a gem.

Despite this, Swan found the game mechanics "mix the elegant with the clumsy, resulting in an awkward set of rules that requires a lot of second-guessing from the referee."

On the awkward side, Swan found the multi-mode combat rules "extremely complicated, forcing players to switch between role-playing and board gaming."