Mainframe Defenders — cheap CD keys, compare prices
Is it worth buying?
- Reviews are solid. (Steam 88%)
- The price is above its low (was €0.49), 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
Turn-based tactics centered on gear and unit customization, with simple combat and high replayability. Items grant not just stat boosts but distinct mechanics that combine into powerful builds.
Did you know?
The game was self-developed and self-published by the small studio Synthetic Domain in 2020.
Best price today
€0.63
all-time low: official €0.49 · keyshop €0.59 (+29%)
The cheapest Mainframe Defenders key right now costs €0.63 at Steam — the best of 7 compared offers. The lowest price we have recorded for this game: €0.49.
The average low over the past 5 months was €0.61.
Prices as of
Steam best price Official store
Driffle Marketplace
No offers match these filters — try widening them.
Listed seller price shown — payment fees may vary by method.
Mainframe Defenders prices by store 6
| Store | Type | Price |
|---|---|---|
| Steam | Official store | €0.63 |
| Gamivo | Marketplace | €0.93 |
| Kinguin | Marketplace | €1.49 |
| Driffle | Marketplace | €1.65 |
| G2A | Marketplace | €2.61 |
| K4G | Marketplace | €7.03 |
Lowest — official stores
€0.49
Jul 2026
Lowest — keyshops
€0.59
Aug 2026
Price history
last 89 daysMonthly price lows
| Month | Lowest official | Lowest keyshop |
|---|---|---|
| Oct 2026 | €0.63 | €0.93 |
| Sept 2026 | €4.90 | €0.93 |
| Aug 2026 | €0.49 | €0.59 |
| Jul 2026 | €0.49 | €0.59 |
| Jun 2026 | €0.49 | €1.45 |
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, Gamivo, Kinguin, Driffle, G2A, K4G
- GOG key — on GOG.com → Redeem a code (or in GOG Galaxy: Add games & friends → Redeem GOG code). Stores with this activation: Driffle
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All-time low so far: €0.49
System requirements
| Minimum | |
|---|---|
| OS | Windows 7 or later |
| Processor | Intel Celeron |
| Memory | 2048 MB RAM |
| DirectX | Version 10 |
| Storage | 200 MB available space |
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About this game — FAQ
Can Mainframe Defenders be played single-player?
Yes, Mainframe Defenders is a single-player game.
What languages does Mainframe Defenders support?
Mainframe Defenders is available in: English, Russian, Hungarian, German, Portuguese - Portugal, French, Italian, Spanish - Spain and 5 more.
FAQ
Where is the cheapest place to buy a Mainframe Defenders key?
The cheapest Mainframe Defenders key is currently sold by Steam for €0.63. That is the best of 7 offers we compare; prices are refreshed regularly. The lowest price we have ever recorded for this game: €0.49.
How much does Mainframe Defenders cost?
Mainframe Defenders currently costs from €0.63 — 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.