GOG Sale: 50% off Witcher 3! 80% off D&D classic games (Baldur's Gate, Icewind Dale, etc)

SDI: Strategic Defense Initiative

Critic Score User Score
Commodore 64
Amstrad CPC
Not an American user?


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 Title screen and main menu
SDI: Strategic Defense Initiative Atari ST In the defensive stage
SDI: Strategic Defense Initiative ZX Spectrum Slotting between the platforms
SDI: Strategic Defense Initiative Arcade Defensive Half.

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

There are no reviews for this game.

Critic Reviews

Sinclair User ZX Spectrum Feb, 1989 90 out of 100 90
neXGam SEGA Master System Feb 02, 2010 8.6 out of 10 86
ACE (Advanced Computer Entertainment) Atari ST Dec, 1988 844 out of 1000 84
The Games Machine (UK) SEGA Master System Apr, 1988 81 out of 100 81
Génération 4 Atari ST Dec, 1988 77 out of 100 77
Computer and Video Games (CVG) Commodore 64 Sep, 1991 72 out of 100 72
Amiga Computing Amiga Sep, 1989 64 out of 100 64
Computer and Video Games (CVG) Commodore 64 Jul, 1991 54 out of 100 54
Commodore Force Commodore 64 Aug, 1993 46 out of 100 46
VideoGame SEGA Master System Mar, 1991 2 Stars2 Stars2 Stars2 Stars2 Stars 40


There are currently no topics for this game.


There is no trivia on file for this game.

Contributed to by chirinea (35989), Martin Smith (63028) and LepricahnsGold (104943)