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''SDI'' was ported to computer platforms published by Creator/{{Activision}} as well as the UsefulNotes/SegaMasterSystem as ''Global Defense'', as noted below. The arcade and the Sega Master System versions were re-released on UsefulNotes/PlayStation2 in 2005 under ''Sega Ages 2500 Series'' label bundled with ''Quartet''.
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''SDI'' was ported to computer platforms published by Creator/{{Activision}} as well as the UsefulNotes/SegaMasterSystem Platform/SegaMasterSystem as ''Global Defense'', as noted below. The arcade and the Sega Master System versions were re-released on UsefulNotes/PlayStation2 Platform/PlayStation2 in 2005 under ''Sega Ages 2500 Series'' label bundled with ''Quartet''.
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* StandardizedSpaceViews: Each stage has a background oriented in a way that you always see the Earth, the Moon, asteroids, the planet Saturn (in ''Global Defense''), and {{PlanetSpaceship}}s at different angles that scroll past the screen. There is no shot of just the stars.
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* StandardizedSpaceViews: Each stage has a background oriented in a way that you always see the Earth, the Moon, asteroids, the planet Saturn (in ''Global Defense''), and {{PlanetSpaceship}}s {{Planet Spaceship}}s at different angles that scroll past the screen. There is no shot of just the stars.
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* StandardizedSpaceViews: Each stage has a background oriented in a way that you always see the Earth, the Moon, the planet Saturn (in ''Global Defense''), and/or asteroids at different angles that scroll past the screen. There is no shot of just the stars.
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* StandardizedSpaceViews: Each stage has a background oriented in a way that you always see the Earth, the Moon, asteroids, the planet Saturn (in ''Global Defense''), and/or asteroids and {{PlanetSpaceship}}s at different angles that scroll past the screen. There is no shot of just the stars.
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* AllThereInTheManual: There's no real plot in the game except a short opening in which a missile destroys New York City. You get that in the advertisement (with a tagline "The dreaded space war has at last begun!") but it's still an ExcusePlot at best. The manual for ''Global Defense'' just mentions that the "enemy" is attacking Earth from bases all over the galaxy.
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* AllThereInTheManual: There's no real plot in the game except a short opening in which a missile destroys New York City. You get that in the advertisement (with a tagline "The dreaded space war has at last begun!") but it's still an ExcusePlot at best. The manual for ''Global Defense'' just mentions that the "enemy" (whatever it is) is attacking Earth again, from bases all over the galaxy.galaxy.
* AsteroidThicket: The asteroid belt is one of the stages. It's full of space rocks, harmless as they're just background scenery save for those that have enemy bases on them firing at you.
* AsteroidThicket: The asteroid belt is one of the stages. It's full of space rocks, harmless as they're just background scenery save for those that have enemy bases on them firing at you.
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* StandardizedSpaceViews: Each stage has a background oriented in a way that you always see the Earth, the Moon, the planet Saturn, and/or asteroids at different angles that scroll past the screen. There is no shot of just the stars.
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* StandardizedSpaceViews: Each stage has a background oriented in a way that you always see the Earth, the Moon, the planet Saturn, Saturn (in ''Global Defense''), and/or asteroids at different angles that scroll past the screen. There is no shot of just the stars.
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* AllThereInTheManual: There's no real plot in the game except a short opening in which a missile destroys the New York City. You get that in the advertisement (with a tagline "The dreaded space war has at last begun!") but it's still an ExcusePlot at best.
to:
* AllThereInTheManual: There's no real plot in the game except a short opening in which a missile destroys the New York City. You get that in the advertisement (with a tagline "The dreaded space war has at last begun!") but it's still an ExcusePlot at best. The manual for ''Global Defense'' just mentions that the "enemy" is attacking Earth from bases all over the galaxy.
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* HoldTheLine: In the Defensive Half, your goal is to prevent missiles from hitting your base and keep the damage done to it to a minimum. When the Damage meter becomes full, it's a game over for you.
* KillSat: You play as one, which is remote-controlled and mounted with laser cannon. This is reflected in the controls, as you have to aim your crosshair with trackball and move the satellite with joystick.
* KillSat: You play as one, which is remote-controlled and mounted with laser cannon. This is reflected in the controls, as you have to aim your crosshair with trackball and move the satellite with joystick.
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* HoldTheLine: In the Defensive Half, your goal is to prevent missiles from hitting your base (Earth shows the North American continent as an exception), and keep the damage done to it to a minimum. When the Damage meter becomes full, it's a game over for you.
* KillSat: You play as one, which is remote-controlled and mounted with lasercannon.cannon, and that goes back to the cargo bay of a space shuttle when a stage ends. This is reflected in the controls, as you have to aim your crosshair with trackball and move the satellite with joystick.
* KillSat: You play as one, which is remote-controlled and mounted with laser
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* StandardizedSpaceViews: Each stage has a background oriented in a way that you always see the Earth, the Moon, and/or asteroids at different angles that scroll past the screen. There is no shot of just the stars.
* AWinnerIsYou: The ending is non-existent; you have Statue of Liberty against black background and a couple lines congratulating you, and that's it. It also has a typo in spite of it.
* AWinnerIsYou: The ending is non-existent; you have Statue of Liberty against black background and a couple lines congratulating you, and that's it. It also has a typo in spite of it.
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* StandardizedSpaceViews: Each stage has a background oriented in a way that you always see the Earth, the Moon, the planet Saturn, and/or asteroids at different angles that scroll past the screen. There is no shot of just the stars.
* AWinnerIsYou: The ending is non-existent; you have Statue of Liberty against blackbackground background, with white doves flying at least in ''Global Defense'', and a couple lines congratulating you, and that's it. It also has a typo in spite of it.
* AWinnerIsYou: The ending is non-existent; you have Statue of Liberty against black
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''SDI'' was ported to computer platforms published by Creator/{{Activision}} as well as the UsefulNotes/SegaMasterSystem. The arcade and the Sega Master System versions were re-released on UsefulNotes/PlayStation2 in 2005 under ''Sega Ages 2500 Series'' label bundled with ''Quartet''.
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''SDI'' was ported to computer platforms published by Creator/{{Activision}} as well as the UsefulNotes/SegaMasterSystem.UsefulNotes/SegaMasterSystem as ''Global Defense'', as noted below. The arcade and the Sega Master System versions were re-released on UsefulNotes/PlayStation2 in 2005 under ''Sega Ages 2500 Series'' label bundled with ''Quartet''.
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''SDI: Strategic Defense Initiative'' is an [[UsefulNotes/ArcadeGame arcade]] [[ShootEmUp shoot-em-up]] developed and published by Creator/{{Sega}} in 1987.
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''SDI: Strategic Defense Initiative'' is an [[UsefulNotes/ArcadeGame arcade]] [[ShootEmUp shoot-em-up]] shoot 'em up]] developed and published by Creator/{{Sega}} in 1987.
* AllThereInTheManual: There's no real plot in the game except a short opening in which a missile destroys the New York City. You get that in the advertisement (with a tagline "The dreaded space war has at last begun!") but it's still an ExcusePlot at best.
* KillSat: You play as one, which is remote-controlled and mounted with laser cannon. This is reflected in the controls, as you have to aim your crosshair with trackball and move the satellite with joystick.
* StandardizedSpaceViews: Each stage has a background oriented in a way that you always see the Earth, the Moon, and/or asteroids at different angles that scroll past the screen. There is no shot of just the stars.
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-->You defended your state
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-->You defended your statestate
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Added DiffLines:
''SDI: Strategic Defense Initiative'' is an [[UsefulNotes/ArcadeGame arcade]] [[ShootEmUp shoot-em-up]] developed and published by Creator/{{Sega}} in 1987.
In this game, you control the Strategic Defense Initiative satellite orbiting the Earth who must defend it from missiles and other antagonistic warheads sent by your enemy. Each stage is split into two phases, the Offensive Half and the Defensive Half. In the Offensive Half, it plays like a HorizontalScrollingShooter, where you destory the enemy's missiles by moving a crosshair (via trackball controller) and shooting at them while moving your own satellite (via joystick) to avoid projectiles shot against you. In the Defensive Half, it becomes a tower defense game like ''VideoGame/MissileCommand'', where you're tasked with projecting your base (presumably on the Moon); let the missiles damage your homeland too much and your game will prematurely reach game over.
''SDI'' was ported to computer platforms published by Creator/{{Activision}} as well as the UsefulNotes/SegaMasterSystem. The arcade and the Sega Master System versions were re-released on UsefulNotes/PlayStation2 in 2005 under ''Sega Ages 2500 Series'' label bundled with ''Quartet''.
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!!''SDI: Strategic Defense Initiative'' contains examples of:
* TheCameo: If you get a perfect rank in the Offensive Half, it plays a short animation featuring Flicky, the blue bird from ''VideoGame/{{Flicky}}''.
* GameplayRoulette: ''SDI'' shifts genres between the Offensive Half and the Defensive Half; the former is like a HorizontalScrollingShooter (although it's also a VerticalScrollingShooter because "enemies" can come from top and below, not just sides) and the latter is a defense game similar to ''VideoGame/MissileCommand''.
* HoldTheLine: In the Defensive Half, your goal is to prevent missiles from hitting your base and keep the damage done to it to a minimum. When the Damage meter becomes full, it's a game over for you.
* MarketBasedTitle: The Sega Master System version is re-titled ''Global Defense'' in the North America and Europe.
* SkippableBoss: Normally, you have to pass both Offensive Half and Defensive Half to complete a full stage. However, if you managed to shoot down every warhead in the first phase and get a perfect score, the Defensive Half is skipped.
* AWinnerIsYou: The ending is non-existent; you have Statue of Liberty against black background and a couple lines congratulating you, and that's it. It also has a typo in spite of it.
-->Congratuations ''[sic]''
-->You defended your state
In this game, you control the Strategic Defense Initiative satellite orbiting the Earth who must defend it from missiles and other antagonistic warheads sent by your enemy. Each stage is split into two phases, the Offensive Half and the Defensive Half. In the Offensive Half, it plays like a HorizontalScrollingShooter, where you destory the enemy's missiles by moving a crosshair (via trackball controller) and shooting at them while moving your own satellite (via joystick) to avoid projectiles shot against you. In the Defensive Half, it becomes a tower defense game like ''VideoGame/MissileCommand'', where you're tasked with projecting your base (presumably on the Moon); let the missiles damage your homeland too much and your game will prematurely reach game over.
''SDI'' was ported to computer platforms published by Creator/{{Activision}} as well as the UsefulNotes/SegaMasterSystem. The arcade and the Sega Master System versions were re-released on UsefulNotes/PlayStation2 in 2005 under ''Sega Ages 2500 Series'' label bundled with ''Quartet''.
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!!''SDI: Strategic Defense Initiative'' contains examples of:
* TheCameo: If you get a perfect rank in the Offensive Half, it plays a short animation featuring Flicky, the blue bird from ''VideoGame/{{Flicky}}''.
* GameplayRoulette: ''SDI'' shifts genres between the Offensive Half and the Defensive Half; the former is like a HorizontalScrollingShooter (although it's also a VerticalScrollingShooter because "enemies" can come from top and below, not just sides) and the latter is a defense game similar to ''VideoGame/MissileCommand''.
* HoldTheLine: In the Defensive Half, your goal is to prevent missiles from hitting your base and keep the damage done to it to a minimum. When the Damage meter becomes full, it's a game over for you.
* MarketBasedTitle: The Sega Master System version is re-titled ''Global Defense'' in the North America and Europe.
* SkippableBoss: Normally, you have to pass both Offensive Half and Defensive Half to complete a full stage. However, if you managed to shoot down every warhead in the first phase and get a perfect score, the Defensive Half is skipped.
* AWinnerIsYou: The ending is non-existent; you have Statue of Liberty against black background and a couple lines congratulating you, and that's it. It also has a typo in spite of it.
-->Congratuations ''[sic]''
-->You defended your state
