Repton 3, released 5 November 1986, was developed by Matthew Atkinson at Superior’s invitation since Tim Tyler was not interested in programming it—although he did design some of the levels for the new game. While the first two games had only taken a month each to program, Repton 3 took eight months. It reverts to the form of a series of time-limited, password-protected levels. A few new features were introduced: fungus (a substance that gradually spreads wherever it finds space and kills Repton on contact), time capsules (resetting the current level’s time limit each time one is collected), crowns and a timebomb which must be defused to complete each level. The inclusion of the timebomb means that, as well as collecting all of the diamonds and crowns, the players have to plan their routes so as to finish up at the timebomb at the end of the level.
Repton 3 includes a map editor along with the game, so that data files can be created with new maps and graphics for the levels. Three themed sets of such files were released as continuations of Repton 3, with the titles Around the World in 40 Screens (1987), The Life of Repton (1987) and Repton Thru Time (1988). These three titles use a slightly modified game engine, in which the algorithm for deciding on the direction spirits first move at the start of a level is improved. They all come with the same game editor as Repton 3.
The Rocketeer has released a special Redux Edition of Repton 3 for the BBC Micro which is now available to download here: repton3.ssd