SDI: Strategic Defense Initiative

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ZX Spectrum
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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 Atari ST Notice the shot trajectory mid-screen
SDI: Strategic Defense Initiative SEGA Master System Introduction
SDI: Strategic Defense Initiative Commodore 64 Stage 1, Offensive
SDI: Strategic Defense Initiative Commodore 64 I need to shoot the incoming missiles.

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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Critic Reviews

neXGam SEGA Master System Feb 02, 2010 8.6 out of 10 86
The One Atari ST Nov, 1988 86 out of 100 86
The Games Machine (UK) SEGA Master System Apr, 1988 81 out of 100 81
Computer and Video Games (CVG) SEGA Master System Apr, 1988 8 out of 10 80
ASM (Aktueller Software Markt) Atari ST Nov, 1988 8 out of 12 67
ACE (Advanced Computer Entertainment) SEGA Master System Nov, 1988 618 out of 1000 62
The Games Machine (UK) Atari ST Jan, 1989 56 out of 100 56
Computer and Video Games (CVG) Commodore 64 Jul, 1991 54 out of 100 54
The Games Machine (UK) ZX Spectrum May, 1989 37 out of 100 37
Game Freaks 365 SEGA Master System 2000 3.5 out of 10 35


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Contributed to by chirinea (35891), Martin Smith (63030) and LepricahnsGold (104475)