Space Invaders

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Space Invaders
System(s): SG-1000
Publisher: Sega
Developer: Sega
Licensor: Taito
Genre: Shooting
Number of players: 1-2 (alternating)
Release Date RRP Code JP 1985-06 ¥4,3004,300 G-1045 TW 198x
Non-Sega versions Template:AC ?? Arcade Atari 2600 Atari 5200 Atari 8-bit family Game Boy MSX Nintendo Entertainment System PC-9800 series Super Game Boy Super NES

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.

Gameplay

Gameplay

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 or and shoots with or . 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.

Enemies

	Octopus
	Worth 10 points.
	Crab
	Worth 20 points.
	Squid
	Worth 30 points.
	UFO
	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

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Versions

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
Cover
Cart Manual

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)