SDI ZX Spectrum Price Guide & Value
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Details
- Console
- ZX Spectrum
- Genre
- Action & Adventure
- Publisher
- Activision
- Release
- 1987
🌍 Market Value
Last update: 2/1/2026
LOOSE
US/NTSC ---
EU/PAL ---
JP/NTSC-J ---
HOT
COMPLETE (CIB)
US/NTSC $11
EU/PAL ---
JP/NTSC-J ---
NEW (SEALED)
US/NTSC ---
EU/PAL ---
JP/NTSC-J ---
GRADED
US/NTSC ---
EU/PAL ---
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Price History
Expert Analysis SDI
Market data for SDI on ZX Spectrum. This action & adventure title, published by Activision, published in 1987, remains highly sought after by collectors. Prices are updated daily based on verified sales. The current average price for a complete copy (CIB) is €11.31. Check our price history chart below to track market trends and find the best time to buy or sell.
Is SDI Rare?
Released in 1987 for ZX Spectrum, SDI is a action & adventure title from Activision that represents an interesting piece for any collector.
The price stability makes this a reliable choice for collectors. The consistent demand for Activision's classic titles, combined with the appeal of the action & adventure genre, makes it a solid addition to any ZX Spectrum collection.
Description
SDI: Strategic Defense Initiative, or simply titled SDI and sometimes known as Global Defense. Players control a satellite and must destroy enemies by moving a crosshair over them and firing the satellite's weapons.