released for the Electron, featuring a subset of Logo focused on the interactive aspects of the language. Acornsoft Logo was provided on ROM cartridge and offered a vocabulary of over 200 commands as part of a more comprehensive implementation of the language, exposing its list processing foundations. Turtle Graphics was substantially cheaper than Logo: by 1987, the former had been reportedly discounted to under £3 whereas the latter cost "less than £30". Unlike other Acornsoft language products, however, Logo was supplied with "two thick manuals". Games Of the twelve software titles announced by Acornsoft for the Electron at the machine's launch, six were games titles: Snapper, Monsters (a clone of Space Panic), Meteors (a clone of Asteroids), Starship Command, Chess, and the combined title Draughts and Reversi. When the Plus 1 expansion was launched in 1984, three of these titles - Hopper, Snapper and Starship Command - were among the six ROM cartridge titles available at launch, together with the adventure Countdown to Doom. Acornsoft would continue to release games including those based on existing arcade games such as Arcadians (based on Galaxian) and Hopper (based on Frogger), as well as original titles such as Free Fall and Elite. Micro Power, already an established BBC Micro games publisher, also entered the Electron market at a relatively early stage, offering ten initial titles either converted from the BBC Micro, in the case of Escape from Moonbase Alpha and Killer Gorilla, or "completely re-written", in the case of Moonraider (due to differences in the screen handling between the machines). Superior Software, also a significant publisher for the BBC Micro, routinely released games for both machines, notably a licensed version of Atari's Tempest in 1985, but also successful original titles such as the Repton series of games, Citadel, Thrust and Galaforce. Superior's role in games publishing for the Acorn machines expanded in 1986 when the company acquired the right to use the Acornsoft brand, leading to the co-branding of games and compilations released by the company and the re-release of existing Acornsoft titles with this branding, Elite among them. The company would subsequently release another "masterpiece" with bundled novella - the 1988 game Exile - as well as numerous conversions and compilations. By 1988, the "big three" full-price games publishers for the Acorn 8-bit market were identified as Superior Software, Audiogenic (ASL) and Tynesoft, with Top Ten and Alternative Software being the significant