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SDI: Strategic Defense Initiative

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Commodore 64
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SDI: Strategic Defense Initiative 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.


SDI: Strategic Defense Initiative Amstrad CPC Results of the offensive stage.
SDI: Strategic Defense Initiative SEGA Master System Trying to save another planet
SDI: Strategic Defense Initiative Amstrad CPC Loading screen
SDI: Strategic Defense Initiative Atari ST Loading screen

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

User Reviews

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The Press Says

Sinclair User ZX Spectrum Feb, 1989 90 out of 100 90
Sinclair User ZX Spectrum Jul, 1991 70 out of 100 70
Power Play SEGA Master System Apr, 1988 6.5 out of 10 65
Your Sinclair ZX Spectrum Jul, 1991 64 out of 100 64
Your Sinclair ZX Spectrum Mar, 1989 6 out of 10 60
Crash! ZX Spectrum Feb, 1989 59 out of 100 59
The Video Game Critic SEGA Master System Nov 14, 2000 C+ 58
Commodore Force Commodore 64 Aug, 1993 46 out of 100 46
VideoGame SEGA Master System Mar, 1991 2 Stars2 Stars2 Stars2 Stars2 Stars 40
Tilt SEGA Master System Mar, 1988 8 out of 20 40


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Contributed to by chirinea (33559), Martin Smith (63155) and LepricahnsGold (75586)