Prison Architect - Undead — cheap CD keys, compare prices
Is it worth buying?
- The price is above its low (was €1.34), but within a reasonable range. Notify me on a drop →
Estimate based on public reviews (Metacritic/Steam) and price history — the final call is yours.
About the game
Undead is an expansion for Prison Architect, the prison-management simulation. It brings an entirely new scenario in which the only objective is survival: wardens must fend off attacks from the undead, protect their inmates, and free the prison from an unprecedented catastrophe. Developed by Double Eleven and Introversion Software and published by Paradox Interactive in 2023, it adds a spooky horror twist to the familiar strategy formula.
Best price today
€1.49
all-time low: official €1.34 · keyshop €1.55 (+11%)
The cheapest Prison Architect - Undead key right now costs €1.49 at Steam — the best of 9 compared offers. The lowest price we have recorded for this game: €1.34.
The average low over the past 5 months was €1.39.
↳ chosen by the region label on the key — not a guarantee
Prices as of
Steam best price Official store
Kinguin Marketplace
Fanatical Official store
Gog Official store
No offers match these filters — try widening them.
Listed seller price shown — payment fees may vary by method.
Prison Architect - Undead prices by store 8
| Store | Type | Price |
|---|---|---|
| Steam | Official store | €1.49 |
| Kinguin | Marketplace | €1.93 |
| Instant Gaming | Marketplace | €2.09 |
| Gamivo | Marketplace | €2.12 |
| K4G | Marketplace | €2.12 |
| Fanatical | Official store | €2.63 |
| Gog | Official store | €2.67 |
| G2A | Marketplace | €3.01 |
Lowest — official stores
€1.34
Sept 2026
Lowest — keyshops
€1.55
Sept 2026
Price history
last 89 daysMonthly price lows
| Month | Lowest official | Lowest keyshop |
|---|---|---|
| Oct 2026 | €1.34 | €1.93 |
| Sept 2026 | €1.34 | €1.55 |
| Aug 2026 | €1.37 | €2.24 |
| Jul 2026 | €1.40 | €2.24 |
| Jun 2026 | €1.49 | €9.34 |
Lowest in-stock price per month from our price history; the current month is the low so far.
How to activate your key
- Steam key — open the Steam client → Games → Activate a Product on Steam → enter the key. Stores with this activation: Steam, Kinguin, Instant Gaming, Gamivo, K4G, Fanatical, G2A
- GOG key — on GOG.com → Redeem a code (or in GOG Galaxy: Add games & friends → Redeem GOG code). Stores with this activation: Gog
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All-time low so far: €1.34
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FAQ
Where is the cheapest place to buy a Prison Architect - Undead key?
The cheapest Prison Architect - Undead key is currently sold by Steam for €1.49. That is the best of 9 offers we compare; prices are refreshed regularly. The lowest price we have ever recorded for this game: €1.34.
How much does Prison Architect - Undead cost?
Prison Architect - Undead currently costs from €1.49 — the cheapest offer across the stores we track.
Is Steam an official store or a keyshop?
Steam is an official store — keys come directly from the publisher or an authorized distributor.
Are keys from these stores legal?
Buying is legal — keys come from the grey market, so a small deactivation risk exists. So before paying, check the seller's buyer protection.
Which key region should I pick?
Global activates everywhere. Regional keys (Europe, North America, RU-CIS) only work on accounts from that region — use the Region filter to match your account.
What is an activation platform?
The service where the key activates — Steam, GOG, Epic or the publisher's platform. A key for one platform won't work on another, hence the separate filter.
What's the difference between editions?
Standard is the base game; Deluxe usually adds an expansion or bonus content. The edition filter shows exactly that variant, with no mixed prices.