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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 Commodore 64 I am firing my laser.
SDI: Strategic Defense Initiative Commodore 64 I lost all my lives. Game over.
SDI: Strategic Defense Initiative Commodore 64 Main menu
SDI: Strategic Defense Initiative Commodore 64 Stage 1, Offensive

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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

Computer and Video Games (CVG) Sep, 1991 72 out of 100 72
Commodore Format Jun, 1991 64 out of 100 64
The Games Machine (UK) May, 1989 56 out of 100 56
Computer and Video Games (CVG) Jul, 1991 54 out of 100 54
Commodore Force Aug, 1993 46 out of 100 46


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Martin Smith (66870) added SDI: Strategic Defense Initiative (Commodore 64) on Jun 28, 2005
Other platforms contributed by chirinea (44740), Martin Smith (66870) and LepricahnsGold (128364)