Quartet (c) 1986 Sega.
A platform shoot-em-up hybrid from Sega for one to four players, selected from either Joe (yellow), Mary (red), Lee (blue) and Edgar (green). The action takes place over a number of sideways scrolling levels, the bulk of which consist of straightforward platform action. On some levels, however, there are jet packs for the players to collect, and the gameplay's emphasis switched to that of a standard, sideways scrolling shoot-em-up.
The object of the game is to destroy an army of robots that have taken over an Earth colony satellite station. Each level has a boss character that must be destroyed. Upon its death it releases a door key that must be used to exit the level. Weapon and character power-ups can be collected to aid players in their task.
Due to its potential for four-player shoot-em-up gameplay, Quartet's gameplay feels vaguely similar to (though by no means as accomplished as) Atari's 1985 classic, 'Gauntlet'.

>>> TECHNICAL DETAILS
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Sega System 16A hardware
Main CPU : 68000 (@ 10 Mhz), I8751 (@ 8 Mhz)
Sound CPU : Z80 (@ 4 Mhz), N7751 (@ 400 Khz)
Sound Chips : YM2151 (@ 4 Mhz), DAC (@ 4 Mhz)
Screen orientation : Horizontal
Video resolution : 320 x 224 pixels
Screen refresh : 60.00 Hz
Palette colors : 6144
Players : 4
Control : 8-way joystick
Buttons : 2

>>> TRIVIA
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Released in April 1986.
Alfa Records released a limited-edition soundtrack album for this game (Sega Game Music Vol.2 - 28XA-108) on 25/02/1987.

>>> GAME UPDATES
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Quartet 2 is not a sequel, it's an update :
* You can change characters on the fly during the game when you continue, while in the original Quartet, the characters were affixed to the specific color joystick areas.
* You can have just two players at the same time instead of four.

>>> DESIGNERS / PROGRAMMERS / STAFF
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Music composed by : Katsuhiro Hayashi (Funkey K.H)
From highscore table : YAS, IDA, KEN, MIY, AGU, CHI, OOO, TOM, KAW, Reiko Kodama (REI), KAW, TOH, Katsuhiro Hayashi (HAY), HON, UCH, JOE, LEE, EDG, MAR

>>> GAME PORTS TO OTHER SYSTEMS
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* Consoles :
Sega Master System (1987)
Sony PlayStation 2 (2005, 'Sega AGES 2500 Series Vol. 21 SDI & Quartett ~SEGA System 16 Collection Vol.1~')
* Computers :
Commodore C64 (1987)
Sinclair ZX Spectrum (1987)
Amstrad CPC (1987)
* Others :
Mobile phones (2002)

>>> OTHER GAME RESOURCES
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Game's rom.
Machine's picture.