Hearts of Iron III: Semper Fi — cheap CD keys, compare prices
Is it worth buying?
Reviews are mixed (Metacritic 65) · The price is well above its low (was €2.49) — worth waiting for a drop or setting an alert Notify me on a drop
About the game
Hearts of Iron III: Semper Fi is the first expansion for the acclaimed World War II strategy game. You take command of any nation in history's largest conflict, leading at every level from division to nation across a variety of scenarios. It was developed by Paradox Development Studio.
Best price today
€4.99
· · check “Region” on the seller’s page
Steam · Official store · Steam
Global key · check “Region” on the seller’s page
You pay Steam directly · same price as on their site
Notify me when it drops below €4.49
- On Steam
- €4.99
- all-time low
- €2.492 Oct
- Average low, 5 mo.
- €4.49
The cheapest Hearts of Iron III: Semper Fi key right now costs €4.99 at Steam. (Prices as of )
Offers 1 · PC · from €4.99
Prices as of
No offers match these filters — try widening them.
Listed seller price shown — payment fees may vary by method.
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Lowest official since we started tracking (Jul 2026)
€2.49
Oct 2026
Lowest — keyshops
€11.94
Aug 2026
Monthly price lows
| Month | Lowest official | Lowest keyshop |
|---|---|---|
| Oct 2026 | €2.49 | — |
| Sept 2026 | €4.99 | — |
| Aug 2026 | €4.99 | €11.94 |
| Jul 2026 | €4.99 | €13.07 |
| Jun 2026 | €4.99 | — |
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
System requirements
| Minimum | |
|---|---|
| OS | Windows XP/Vista/7 |
| Processor | Intel Pentium IV 2.4 GHz or AMD 3500+ (quad core) |
| Memory | 2Gb RAM |
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About this game — FAQ
Does Hearts of Iron III: Semper Fi have co-op?
Yes, Hearts of Iron III: Semper Fi has a co-op mode.
Does Hearts of Iron III: Semper Fi have multiplayer?
Yes, Hearts of Iron III: Semper Fi has multiplayer.
What languages does Hearts of Iron III: Semper Fi support?
Hearts of Iron III: Semper Fi is available in: English.
FAQ
Where is the cheapest place to buy a Hearts of Iron III: Semper Fi key?
The cheapest Hearts of Iron III: Semper Fi key is currently sold by Steam for €4.99. The lowest price we have ever recorded for this game: €2.49.
How much does Hearts of Iron III: Semper Fi cost?
Hearts of Iron III: Semper Fi currently costs from €4.99 — 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.