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Take on a living alien tower that shifts and mutates around you, and the hordes of hostile creatures that dwell within, in this infamous Japanese clone of Gears of War.
Quantum Theory Xbox 360 price & price history
The average CIB price for Quantum Theory (Xbox 360) was $14.65 30 days ago and is $14.48 now — down $0.17. Real-market prices from eBay sold listings, updated daily — see the full price chart above.
Frequently asked questions
- How much is Quantum Theory (Xbox 360) worth?
- Quantum Theory for Xbox 360 is worth $14.48 on average for a complete-in-box (CIB) copy, based on recent eBay sold listings.
- Is Quantum Theory going up or down in price?
- The price is trending down — it was $14.65 30 days ago and is $14.48 now, a $0.17 decrease.
- How does the 100 Coins price compare to PriceCharting?
- PriceCharting publishes one price per condition for Quantum Theory on Xbox 360. 100 Coins computes its own average from the individual eBay sold listings it tracks for this exact edition, weighted so recent sales count for more — which is why the two differ. Both numbers are shown on every condition card above.
- Where does 100 Coins get its price data?
- All prices on 100 Coins come from real eBay sold listings — actual completed transactions, not asking prices or estimates. Prices are updated daily.
| Source | Date | Price | Completeness | Description | Report |
|---|---|---|---|---|---|
| eBay | 2026-04-03 | $10.38 | CIB | QUANTUM THEORY game complete in case w/ manual for Microsoft XBOX 360 | |
| eBay | 2026-03-27 | $4.99 | Game Only | Quantum Theory (Microsoft Xbox 360, 2010) Disc Only-Tested | |
| eBay | 2026-03-26 | $14.99 | CIB | Quantum Theory (Microsoft Xbox 360, 2010) Complete W/Manual | |
| eBay | 2026-03-19 | $14.99 | CIB | Quantum Theory (Xbox 360) CIB Complete in Box | |
| eBay | 2026-03-17 | $49.99 | Sealed | New Sealed Koei Tecmo Quantum Theory Microsoft Xbox 360 Rare | |
| eBay | 2026-03-09 | $10.99 | CIB | Microsoft Xbox 360 CIB Complete TESTED Quantum Theory CF | |
| eBay | 2026-03-09 | $11.77 | CIB | Quantum Theory Microsoft Xbox 360, 2010 Complete READ | |
| eBay | 2026-03-04 | $14.49 | CIB | Quantum Theory (Microsoft Xbox 360, 2010) Complete W/Manual | |
| eBay | 2026-03-01 | $14.50 | CIB | Tecmo Quantum Theory Shooter Action Xbox 360 2010 Manual Included NTSC-U/C | |
| eBay | 2026-02-20 | $14.00 | CIB | Quantum Theory (2010) - Xbox 360 - CIB |
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