This arcade conversion is based around classic-style shoot 'em up action. It puts you in control of a satellite which must ensure that the wave of bombs aimed for the United States do not hit. Direction of motion and direction of fire are controlled independently - on the 16-bit versions you rotate the mouse left and right to direct the targeting, move it up and down to increase the range, and use the joystick to move the satellite and thus avoid any contact.

Each level is split into defensive and offensive stages. On defensive levels you must stop each unit as it heads towards the earth, a lá Missile Command. Offensive stages follow the old 'shoot it before it becomes a danger' philosophy, being free-flying shoot 'em up sections among a network of destructible (but worth saving) platforms.

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Alternate Titles

"SDI - Now The Odds Are Even" -- Spanish title
"SDI" -- Official abbreviation
"Mobile SDI" -- Mobile Sega Ages title
"Global Defense" -- SEGA Master System title

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Merchant	Title	Platform	Price
	Global Defense - Sega Master System	SEGA Master System	$0.70
	SDI: Strategic Defense Initiative
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The Press Says

Computer and Video Games (CVG)	SEGA Master System	Apr, 1988	8 out of 10	80
Power Play	Atari ST	Dec, 1988	71 out of 100	71
Crash!	ZX Spectrum	Jul, 1991	70 out of 100	70
Sinclair User	ZX Spectrum	Jul, 1991	70 out of 100	70
Amiga Computing	Amiga	Sep, 1989	64 out of 100	64
The Video Game Critic	SEGA Master System	Nov 14, 2000	C+	58
The Games Machine (UK)	Amiga	Sep, 1989	57 out of 100	57
GamesCollection	SEGA Master System	Jan 18, 2008	5.5 out of 10	55
Computer and Video Games (CVG)	Commodore 64	Jul, 1991	54 out of 100	54
Game Freaks 365	SEGA Master System	2000	3.5 out of 10	35