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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 Atari ST Stats from the defensive level, with poitns bonuses
SDI: Strategic Defense Initiative Atari ST Game start
SDI: Strategic Defense Initiative Atari ST Dead

Promo Images

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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

User Reviews

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Critic Reviews

The One Nov, 1988 86 out of 100 86
ACE (Advanced Computer Entertainment) Dec, 1988 844 out of 1000 84
Computer and Video Games (CVG) Dec, 1988 81 out of 100 81
Génération 4 Dec, 1988 77 out of 100 77
Power Play Dec, 1988 71 out of 100 71
ASM (Aktueller Software Markt) Nov, 1988 8 out of 12 67
Atari ST User Feb, 1989 6 out of 10 60
The Games Machine (UK) Jan, 1989 56 out of 100 56


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Martin Smith (66830) added SDI: Strategic Defense Initiative (Atari ST) on Jun 27, 2005
Other platforms contributed by chirinea (45544), Martin Smith (66830) and LepricahnsGold (129037)