What is the current going rate for a loose copy of Quantum Theory?

A loose copy of Quantum Theory for Xbox 360 is currently valued at $10.

How much more is a sealed copy worth compared to a complete-in-box version?

A sealed copy is valued at $30, which is $16 more than the $14 complete-in-box version.

Should I sell my Quantum Theory in its original sealed packaging?

Yes, selling it sealed will yield the highest return at $30.

Quantum Theory — Xbox 360 Price & Value

Name: Quantum Theory — Xbox 360 Price & Value
Brand: Xbox

Xbox 360

What Quantum Theory for Xbox 360 is worth — loose cart, complete in box, and sealed.

Quantum Theory value — Loose $10 · Complete (CIB) $14 · Sealed (new) $30. Prices updated July 2026.

Platform · Xbox 360

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Complete-in-box price history

Monthly CIB value, based on sold comps.

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PriceCharting — Quantum Theory (Xbox 360)$13.62

Game details

Brand: Xbox
Platform: Xbox 360

Quantum Theory (Xbox 360) resale value

A loose copy of Quantum Theory averages around $10. A complete-in-box (CIB) copy — game, box, and manual — runs about $14, and a factory-sealed copy commands $30.

What drives the price

Condition is everything: a clean, unscratched label, an intact box without crushing, and the original manual can swing the value 30–50%. Test that the game works before you buy or sell.

Price guide

What this actually trades for — sold values by condition vs. what sellers are asking today

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Condition	Value	Based on
Loose	$10	eBay sold comps
Complete (CIB)	$14	eBay sold comps
Sealed (new)	$30	eBay sold comps
Graded (WATA/CGC)	$33	eBay sold comps

Frequently asked questions

What is the current going rate for a loose copy of Quantum Theory?: A loose copy of Quantum Theory for Xbox 360 is currently valued at $10.
How much more is a sealed copy worth compared to a complete-in-box version?: A sealed copy is valued at $30, which is $16 more than the $14 complete-in-box version.
Should I sell my Quantum Theory in its original sealed packaging?: Yes, selling it sealed will yield the highest return at $30.