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SDI: Strategic Defense Initiative

MobyRank MobyScore
Commodore 64
SEGA Master System
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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 SEGA Master System Defend the planet against missiles
SDI: Strategic Defense Initiative ZX Spectrum Slotting between the platforms
SDI: Strategic Defense Initiative Atari ST In the defensive stage
SDI: Strategic Defense Initiative Atari ST Stats from the defensive level, with poitns bonuses

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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The Press Says

ACE (Advanced Computer Entertainment) Atari ST Dec, 1988 844 out of 1000 84
Crash! ZX Spectrum Jul, 1991 70 out of 100 70
Amiga Computing Amiga Sep, 1989 64 out of 100 64
ACE (Advanced Computer Entertainment) SEGA Master System Nov, 1988 618 out of 1000 62
Atari ST User Atari ST Feb, 1989 6 out of 10 60
Computer and Video Games (CVG) ZX Spectrum Jul, 1991 59 out of 100 59
Crash! ZX Spectrum Feb, 1989 59 out of 100 59
VideoGame SEGA Master System Mar, 1991 2 Stars2 Stars2 Stars2 Stars2 Stars 40
Tilt SEGA Master System Mar, 1988 8 out of 20 40
The Games Machine (UK) Amstrad CPC May, 1989 29 out of 100 29


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Contributed to by chirinea (34779), Martin Smith (63054) and LepricahnsGold (92973)