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Your job is to basically find the end-of-level boss, and then defeat it to obtain the key that will open the level exit, but your task is made difficult by the planet's inhabitants. Get the jet-pack to make it easier to navigate the level and shoot any inhabitants that get in the way. These inhabitants will leave behind something that you can get to increase your score, and the inhabitants will eventually regenerate. If any one of them touches you while you have the jet-pack, you land on the ground or the nearest platform, and have to get it again; and the same rule applies to the key.


Quartet Commodore 64 Now carrying the key
Quartet Amstrad CPC Dead...
Quartet Arcade Using the Jet-Pack.
Quartet ZX Spectrum Choose your player

Promo Images

Quartet Other
Quartet Other
Quartet Other
Quartet Other

Alternate Titles

  • "Mobile Quartet" -- Mobile Sega Ages title
  • "Double Target: Cynthia no nemuri" -- Japanese Arcade title
  • "Double Target" -- Japanese SEGA Master System title

Part of the Following Group

User Reviews

Quartet? More like Duet? SEGA Master System James Evans (42)

Critic Reviews

Génération 4 SEGA Master System 1987 90 out of 100 90
Sega Does SEGA Master System Dec 14, 2014 B 75
Tilt SEGA Master System Dec, 1987 13 out of 20 65 SEGA Master System Aug 25, 2016 6 out of 10 60
Computer and Video Games (CVG) Amstrad CPC Jun, 1990 40 out of 100 40
Computer and Video Games (CVG) ZX Spectrum Jun, 1990 39 out of 100 39
Happy Computer Commodore 64 Aug, 1987 37 out of 100 37
ASM (Aktueller Software Markt) Commodore 64 Sep, 1987 4.4 out of 12 37
Commodore Force Commodore 64 Aug, 1993 24 out of 100 24
Computer and Video Games (CVG) Commodore 64 Jun, 1990 23 out of 100 23


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Contributed to by Martin Smith (66864), Pseudo_Intellectual (60962) and Katakis | カタキス (39781)