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. Repton Infinity Repton Infinity was released in 1988, by which time the BBC Micro's popularity as a games platform was beginning to wane. It was developed by Dave Acton and Dave Lawrence (who wrote the user-submitted program section *INFO in Acorn User magazine). It supplements the map editor and graphics editor with a powerful game logic editor which made it possible to alter the way all game objects behaved using a purpose-designed language called Reptol. Four different example games are included to demonstrate its flexibility: Repton 3 - Take 2, with a couple of small technical differences in gameplay from Repton 3; Repton 4, with imaginative new objects including photocopiers and moving jewels; Robbo, “a crazy robot in a strange topsy-turvy world”, according to the game inlay; and Trakker, a chaotic game in which a bulldozer-driving protagonist must destroy various monsters by pushing fruit at them, and all scores are multiples of 17. There was a long-running problem, infamous amongst owners of the B+, the updated BBC B with 64k, when the newly released Repton Infinity ran on the original BBC B but refused to load on the updated B+. A string of unsuccessful replacements were issued before one that was compatible with both was eventually released. EGO: Repton 4 A game marketed as EGO: Repton 4, was released for the Acorn Archimedes in 1992. It was designed by Richard Hanson and programmed by Gary Partis. This was actually an Archimedes conversion of an earlier Amiga/Atari ST game called Personality Crisis with the character of Repton added in. The game bears little relation to the rest of the Repton series, particularly in that contrary to the spirit of the original it relies on "secret" traps and passages which can only be discovered by walking onto them. (The objects and objectives in all the previous Repton games are visible and there are no hidden secrets to