Impossible Mission
Stay a while... stay forever!
Epyx's 1984 platform puzzler combined speech synthesis, smooth animation, and devious puzzles in one unforgettable package.
The Spectrum version is the interesting one
Impossible Mission is remembered as a C64 game, and the reputation is the C64’s: the speech, the animation, the “Another visitor. Stay a while — stay FOREVER!” that a SID could do and a beeper could not.
⚠ There is a Spectrum version, and the press did not rate it the same way. CRASH gave it 76% in November 1985 — a perfectly respectable score, and a long way below the acclaim the C64 original carried. Sinclair User went 4/5. The later budget re-releases fared better: 8/10 in Your Sinclair in 1987, 92% in Sinclair User in 1988.
That gap is the honest story of a great many cross-format titles, and it is usually left out. A game can be a landmark on one machine and a decent port on another, and the entry that only tells you the first half has told you the wrong thing about the second.
📘 Part of the reason is that a port was often a different person’s work entirely. Publishers subcontracted conversions, and the magazines recorded it — CRASH’s review boxes carry lines like “Author: Scott Adams, conversion by Brian Howarth”. Crediting only the original author quietly erases whoever wrote the version being discussed.
The voice that sold it
“Another visitor. Stay a while… stay forever!” Professor Elvin Atombender’s digitised greeting became one of gaming’s first recognisable voice samples. Epyx’s Impossible Mission combined platforming with puzzle-solving as players searched his lair for password pieces. The smooth animation, speech synthesis, and clever design created a C64 classic.
Fast facts
- Developer: Epyx. Original (C64): Dennis Caswell.
- Conversions: not established. Eight-bit ports were routinely subcontracted to different programmers, so Caswell should not be assumed to have written the Spectrum version.
- Release: 1984.
- Platform: C64 (original), ported to many others.
- Speech synthesis: revolutionary use of digitised voice.
- Goal: find 36 puzzle pieces, assemble passwords, reach Atombender.
- Time limit: six hours (real-time).
- Sequel: Impossible Mission II (1988).
The speech
Digitised voice on the C64 seemed impossible:
- “Another visitor. Stay a while… stay forever!”
- “Destroy him, my robots!”
- Death scream when falling.
- Players quoted these lines for decades.
The gameplay
Impossible Mission mixed genres:
Platforming:
- Navigate rooms filled with robots.
- Flip, roll, and time movements.
- Search furniture for puzzle pieces.
- Robots killed on contact.
Puzzles:
- Collect pieces of four passwords.
- Match pieces using in-game computer.
- Assembled passwords unlock final areas.
- Combinatorial challenge.
The animation
Dennis Caswell’s character animation impressed:
- Fluid running and jumping.
- Somersault moves.
- Robot patrol patterns.
- Smooth elevator movement.
The agent moved like nothing else on C64.
The time pressure
Six hours to complete:
- Real-time countdown.
- Death penalties reduced time.
- Strategic room exploration.
- Tension throughout.
The robots
Various robot types patrolled:
- Different movement patterns.
- Some destroyable temporarily.
- Password-protected rooms.
- Learning patrol routes essential.
Legacy
Impossible Mission showed C64 games could have production values. The speech synthesis amazed. The animation impressed. The puzzle-platformer hybrid created unique gameplay. When people discuss C64 classics, Atombender’s greeting echoes through the conversation.