🎮 Play Alien Syndrome (Japan) Online (Sega Master System)

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Alien Syndrome (Japan) cover art
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🕹️ GAME CONTROLS

Action / ButtonKeyboard Key
D-Pad (Up / Down / Left / Right)Arrow Keys
Button AZ or J
Button BX or K
Button X / Turbo AA or U
Button Y / Turbo BS or I
SelectShift
StartEnter

💡 Tip: You can also connect any USB / Bluetooth Gamepad controller!

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🎮 VISUAL CONTROLLER MAPPING & GAMEPAD DIAGRAM Auto-Detect: Active
L1 / LB R1 / RB SELECT START Y X A B RETRO ARCADE
Gamepad InputRetro FunctionKeyboard Key
D-Pad / AnalogCharacter Movement / Steering
Button A (East)Primary Action / Attack / FireZ / K
Button B (South)Secondary / Jump / CancelX / J
Button X / YSpecial / Turbo / Extra FireA / S
SelectInsert Coin / Select OptionRight Shift
StartGame Start / Pause GameEnter
Game info: 👁️ 118 plays
Alien Syndrome (Japan)
box cover
Game title:Alien Syndrome (Japan)
Platform:Sega Master System
Author (released): Unknown (1987)
Emulator Core:SEGAMS
Game Manual: 📖 Official Manual (Built-in)
Share Game:
License:Freeware / Abandonware
Available online emulators for Alien Syndrome (Japan):

Different online emulators are available for Alien Syndrome (Japan). Select an emulator core below for optimal performance:

Emulator Core EngineTechnologyMultiplayerGamepadTouchAdsAction / Switch
EmulatorJS (Default WebAssembly) WebAssembly / JSYESYES YESNO PLAY ⚡
Sega Master System (Recommended) WebAssembly / LibretroYESYES YESNO ▶ ACTIVE
SMS Plus GX WebAssembly / LibretroYESYES YESNO PLAY ⚡
Game description:

Alien Syndrome is a classic top-down run-and-gun shooter developed by SEGA in 1987 for the Sega Master System. You play as troopers Ricky and Mary, infiltrating infested spacecraft to rescue kidnapped hostages from a gruesome alien menace. Armed with a variety of weapon upgrades, you must clear out the hordes and save your crew before the ship’s time bomb detonates, culminating in a fierce boss battle at the end of each stage.

The objective is to explore the labyrinthine levels and locate a set number of hostages to unlock the exit hatch. In the browser, movement is mapped to the Arrow keys, while you can fire your current weapon using the Z or X keys and start the game with Enter. Speed and precision are critical, as a strict timer ticks down continuously.

Always prioritize picking up weapon power-ups, like the laser or fireball, to replace your weak starting blaster. Avoid lingering in one spot, as enemies respawn endlessly, and head straight for the exit once it opens so you have plenty of time on the clock to defeat the boss.

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