| Console: | Sega Master System |
| TV Standard: | NTSC-U |
| Country: | United States of America |
| Developer(s): | Sanritsu, Sega R&D2 |
| Publisher(s): | Sega of America, Inc. |
| Release Date: | 1988-03-15 |
| Players: | 2 |
| Co-op: | No |
| ESRB: | E - Everyone |
| Type: | Action, Shooter |
Two players control two soldiers named Ricky and Mary, who must fight their way through large eight-way scrolling levels rescuing their comrades who are being held by aliens. After they have rescued a certain number of hostages the exit opens and they can pass through it in order to fight the end-of-level guardian. If this monstrosity is defeated, they move onto the next stage. As well as two player simultaneous gameplay, Alien Syndrome features pick-ups which assist the player including better weapons and maps of the current level.
Game Player of Alien Syndrome on Sega Master SystemGenerally, you can review the controls (keyboard) setting during each game in the screen before it starts. Use the arrow keys and “Z”, “X”, “A”, “S”, “Q”, “E” buttons to play, or customize yourself with your gamepad or keyboard.
| Keyboard | Controls |
| ← → ↑ ↓ | Directions for LEFT, RIGHT, UP, DOWN |
| Enter ↵ | START |
| Shift | SELECT |
| Z | A |
| X | B |
| A | X |
| S | Y |
| Q | L |
| E | R |
