Christ Perver is currently working on an Amstrad CPC+/GX4000 port of the Q*Bert arcade game released in 1982 by Gottlieb. He wants the Amstrad CPC+ version to be as close to the original as possible. It is available as a cartridge version (joystick support for GX4000), but also on floppy disk (and tape later). I encourage you to visit Chris Perver's website and read his PDF explaining the game's development.