Question: Arcadians is a fixed shooter for the BBC Micro and Acorn Electron, and is very similar to which arcade game that was developed by Namco and released in October 1979?
Sentence (from "Galaxian"): A fixed shooter game in which the player controls a spaceship at the bottom of the screen, and shoots enemies descending in various directions, it was designed to compete with Taito Corporation's successful earlier game "Space Invaders" (which was released in the previous year, and also imported to the US by Midway Games).
Relevant evidence: No