Space Invaders

From Sega Retro


SpaceInvaders Title.png

Space Invaders
System(s): SG-1000
Publisher: Sega
Licensor: Taito
Genre: Shooting[1]

Number of players: 1-2 (alternating)
Release Date RRP Code
¥4,3004,300[1] G-1045
Non-Sega versions

Space Invaders (スペースインベーダー) is a 1979 milestone arcade game developed by Taito. It was brought to a variety of home video game consoles and computers, including the SG-1000 in 1985. The SG-1000 version does not appear to have been released outside of Japan.


Space Invaders SG, Gameplay.png


Space Invaders was the first fixed shooter game, and it is a progenitor of the shoot-'em-up genre. The player controls a laser turret that can move horizontally and must destroy waves of aliens invaders before they reach the ground. The game has a two-player alternating mode.

Each wave of aliens arranges itself in five rows of eleven invaders. They move left and right as a group, shifting downward (toward the player's turret) each time they reach a screen edge. The goal is to eliminate all of the aliens by shooting them. The aliens have projectile weapons that they occasionally fire at the player's cannon. The laser cannon is partially protected by four stationary defense bunkers, which are gradually destroyed from the top by the aliens (and can also be destroyed from the bottom if the player accidentally fires on one from below). As the invaders are destroyed, the movement of the remaining aliens speeds up.

When an entire wave has been defeated, another wave appears slightly lower than the last. Eventually, the wave spawns with the bottom row right on top of the bunkers. Then the next wave starts from the top of the screen, and subsequent waves are spawned progressively lower again. This loop continues until the game ends.

The player's laser cannon moves with Left or Right and shoots with 1 or 2. The player has three lives and loses one whenever the laser turret is hit by an enemy. However, the game ends immediately if an alien reaches the bottom of the screen.


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Worth 10 points.
Space Invaders SG, Aliens.png
Worth 20 points.
Space Invaders SG, Aliens.png
Worth 30 points.
Space Invaders SG, Aliens.png
This enemy occasionally flies quickly across the top of the screen and randomly awards 50, 100, 150, 200, or 300 points if destroyed.

Photo gallery


Surprisingly, the SG-1000 port of the game was one of the most accurate of its time, surpassing the NES and MSX versions (which were the console's main competitors). Though it adds more color (the arcade version was simply black and white, with translucent overlays to mimic color), the SG-1000 version retains all the original graphics, whereas other ports (especially for Atari systems) redrew the invaders due to various graphical restrictions.

Physical scans

SG-1000 version

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Space Invaders

SG-1000, JP
Space Invaders SG1000 JP Top.jpg
Space Invaders SG1000 JP Back.jpgSpace Invaders SG1000 JP Spine.jpgSpaceInvaders SG1000 JP Box Front.jpgSpace Invaders SG1000 JP Spine2.jpg
Space Invaders SG1000 JP carttop.jpg
Space Invaders SG1000 JP Cart.jpg
Space Invaders SG1000 JP Manual.pdf
SG-1000, TW

Technical information

ROM dump status

System Hash Size Build Date Source Comments
CRC32 6ad5cb3d
MD5 87a97b049ec01b1803b93f06d0407586
SHA-1 a4e4b0c2967e39c4931fba8bc87428f296e461c5
16kB Cartridge (JP)
CRC32 0760ea93
MD5 47359548b666e9e1b6287df5688e2fd2
SHA-1 5a7904697ea8a360066ea8403793227021735969
16kB Cartridge (TW)


NEC Retro has more information related to Space Invaders: The Original Game

Space Invaders

SpaceInvaders Title.png

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Space Invaders SG, Aliens.png
Space Invaders games for Sega systems
Space Invaders (1985) | Space Invaders '90 (1990) | Super Space Invaders (1992) | Space Invaders (1996)
Space Invaders (Dreamcast) (unreleased)
Space Invaders VIC Dual Clones
Alpha Fighter (19??) | Invinco (1979) | Space Attack (1979) | Super Space Attack (1979)