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Alien Syndrome (Game Gear)

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Title Screen

Alien Syndrome

Developer: SIMS
Publishers: Sega (US/EU), SIMS (JP)
Platform: Game Gear
Released in JP: March 19, 1992
Released in US: 1992
Released in EU: 1992

SoundtestIcon.png This game has a hidden sound test.
LevelSelectIcon.png This game has a hidden level select.

Hidden Menus


At the title screen, press 1, 2, 1, 2 for this hidden menu, which has only settings for skill level and a sound test.

(Source: SMSPower)
Yeah dude.

Or, press 2, 2, 2, 2, 2, 1, 1, 2, 2, 2, 2, 2, 1, and then 1+2 for such additions as stage select, lives, captives per stage, and starting weapon.

(Source: GameFAQs (Mezmorize99))