Impossible Mission Amstrad CPC

Your mission Agent 4125 is to foil a horrible plot. From an underground laboratory, Elvin, the scientist, is holding the world hostage under the threat of nuclear annihilation. You must penetrate his stronghold, avoid his human-seeking robots and find the pieces of the secuirity code. Somersault over the robots or use a precious snooze code to deactivate them long enough to search each room. Use the Agency's computer to unscramble the passwords from the code pieces, or try to solve them yourself. You've got to reach Elvin's control centre, but you'd better beware... This mission is stamped IMPOSSIBLE! — Cassette cover

Impossible Mission is a platform computer game for several home computers. The original version for the Commodore 64 was programmed by Dennis Caswell and published by Epyx in 1984.

Though originally developed for the Commodore 64, Impossible Mission was ported to the Apple II, Atari 7800, ZX Spectrum, Acorn Electron, BBC Micro, Amstrad CPC and Sega Master System. Not all of the ports had the same features as the C64 edition, such as speech.

The NTSC Atari 7800 version has a confirmed bug that makes the game impossible to win; it places some of the code pieces underneath computer terminals, which the player cannot search (since attempting to do so will access the terminal). The bug was fixed in the PAL version. Rumors of a bug fix for the NTSC version were put to rest when Atari formally announced the retirement of the Atari 7800 on January 1, 1992. The ZX Spectrum version also has this  bug, although as the placement of code pieces is random, terminals may not always be used to hide the pieces.

The sequel, Impossible Mission II, followed in 1988. It further complicated the quest with new traps and items. Elvin's stronghold also grew in size, divided into a number of towers which the player had to traverse, all the while picking up pieces of the password (an aural one this time).

A popular rumor is that the game ElectroCop was originally a sequel to Impossible Mission, but this rumor has not been substantiated.

In 1994, Impossible Mission 2025 was released for the Amiga. It kept the same idea as the previous games, and mainly featured updated graphics and audio, as well as allowing the player to choose between three different characters. The game also contains the Commodore 64 version of Impossible Mission.

Source:Wikipedia