Invasion Protocol — cheap CD keys, compare prices
Is it worth buying?
- The price is at or near its all-time low — a good time to buy.
Estimate based on public reviews (Metacritic/Steam) and price history — the final call is yours.
About the game
In Invasion Protocol, you're not the defender — you are the invasion, dropping onto a bug-infested planet dressed as a skull-helmeted soldier. Players pick a class, keep the trigger down, push through punishing objectives, and switch gear and abilities mid-fight, picking up additional classes and equipment along the way. Developed and published by GoldenGod Games, the game has been available since 2026.
Best price today
€4.99
all-time low: official €4.99 near low
The cheapest Invasion Protocol key right now costs €4.99 at Steam. The lowest price we have recorded for this game: €4.99.
The average low over the past 4 months was €5.49.
Prices as of
Steam best price Official store
No offers match these filters — try widening them.
Listed seller price shown — payment fees may vary by method.
Lowest — official stores
€4.99
Sept 2026
Price history
last 69 daysMonthly price lows
| Month | Lowest official | Lowest keyshop |
|---|---|---|
| Oct 2026 | €4.99 | — |
| Sept 2026 | €4.99 | — |
| Aug 2026 | €5.99 | — |
| Jul 2026 | €5.99 | — |
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
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All-time low so far: €4.99
System requirements
| Minimum | |
|---|---|
| OS | 7 / 8 / 10 / 11 |
| Processor | 2 GHz (32/64bits) |
| Memory | 512 MB RAM |
| Graphics | Minimum Resolution - 1336x768, Graphics Card with at least 128MB Dedicated Memory |
| Storage | 300 MB available space |
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About this game — FAQ
Does Invasion Protocol have co-op?
Yes, Invasion Protocol supports local (split-screen) co-op.
Does Invasion Protocol have multiplayer?
Yes, Invasion Protocol has multiplayer.
Can Invasion Protocol be played single-player?
Yes, besides multiplayer modes, Invasion Protocol can also be played solo (single-player).
Does Invasion Protocol support a controller/gamepad?
Yes, Invasion Protocol has full controller support.
What languages does Invasion Protocol support?
Invasion Protocol is available in: English, French, German, Spanish - Spain, Japanese, Portuguese - Brazil, Portuguese - Portugal, Simplified Chinese.
Can Invasion Protocol be played co-op via Remote Play Together?
Yes — Steam Remote Play Together lets you invite friends to play local modes online without them owning the game.
Does Invasion Protocol use Steam Cloud saves?
Yes, Invasion Protocol uses Steam Cloud, so your saves sync across devices.
FAQ
Where is the cheapest place to buy a Invasion Protocol key?
The cheapest Invasion Protocol key is currently sold by Steam for €4.99. The lowest price we have ever recorded for this game: €4.99.
How much does Invasion Protocol cost?
Invasion Protocol 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.