Mainframe Defenders

77KS
Released Feb 25, 2020by Synthetic DomainVery Positive(88% of 785 Steam reviews)Recent: 93% positive

MAINFRAME DEFENDERS - Turn-based tactics centered around gear and unit customization. It offers simple combat, high replayability, and tons of loot. Items don't just provide stats boost, but also offer distinct mechanics that can be combined into powerful builds.

Offers

What are keyshops?

Official stores

Official stores with direct support.

Steam
SteamOfficial
updated

Keyshops

Third-party resellers. Often cheaper, without official store support. Keyshop prices vs Steam →

Eneba
EnebaKeyshop
updated
Lowest price
-82% vs Steam€0.89
Shop now ↗
Gamivo
GamivoKeyshop
updated
-81% vs Steam€0.91
Shop now ↗
K4G
K4GKeyshop
updated

Multipacks (12)

About Mainframe Defenders

MAINFRAME DEFENDERS

Tactical retrofuturistic strategy game. A computer virus has infiltrated the "Stargazer" research complex. Most of the robotic units are controlled by the virus. Lead a squad of 4 prototypes on a mission to defend complex mainframe. You'll have to repel assaults, destroy unit fabricators, download valuable data, clear infected nodes, and do more on your way to the deepest parts of the complex. Work with item limitations and drawbacks to build powerful combinations. Destroy your enemies with diverse tactics: overheat them, melt with corrosion, absorb damage, and return fire. But don't rely on a single strategy too much - enemies might have a way to counter it. But above everything else: defend the Mainframe!

* RETRO STYLE: Graphics, inspired by 80s terminal PC with hybrid synthwave soundtrack.

* DIVERSE TACTICS: Cook enemy robots to death, bury them under your bullets, eliminate with a single powerful shot, or render your opponents useless with debuffs - this game is designed with a lot of viable strategies in mind.

* BUILD YOUR SQUAD: Similar to how in card games you have to build your deck, in Mainframe Defenders you have to combine different items with unique abilities, to create an unstoppable squad. Work with item drawbacks or double down on them, creating flawed, yet powerful build!

* UNIQUE ENEMIES: Enemy squad won't sit idle, though. Each unit has its own role in the squad and designed to counter certain strategies. Pick your targets wisely, or you will lose.

* PROCEDURAL LEVELS: Hand-made rooms are combined with procedural generation to create random levels. Missions have differing objectives, combined with unique mission conditions. Will you accept the challenge or avoid the unknown and risk falling behind?

* PROGRESSION SYSTEM: Victory or defeat, the game is not over yet! Unlock new units, each with a unique set of upgrades and load-outs. Unlock new items to bolster your new strategies.


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Game details

Mainframe Defenders price history

Lowest tracked price: €0.63 (Jul 7, 2026) · current best: €0.89 across 4 stores.

Mainframe Defenders player count & reviews

88% positive reviews all-time · 6 peak players in the last 30 days.

Mainframe Defenders — frequently asked questions

Where can I buy Mainframe Defenders at the cheapest price?

Right now the cheapest offer for Mainframe Defenders is €0.89 at Eneba. KingsPrice compares 6 offers from 4 stores — official stores and keyshops — and refreshes prices throughout the day.

What is the lowest price Mainframe Defenders has ever been?

The lowest price KingsPrice has tracked for Mainframe Defenders is €0.63 (recorded on Jul 7, 2026). This covers the stores and period we monitor — set a price alert to catch the next drop to that level.

How many people play Mainframe Defenders?

Mainframe Defenders peaked at 6 concurrent players on Steam in the last 30 days (highest on Jul 21, 2026). The player chart on this page updates daily.

Is it safe to buy a Mainframe Defenders Steam key from a keyshop?

Keyshops are marketplaces that resell game keys, usually below official store prices. The keyshops listed on KingsPrice deliver genuine Steam keys, but buyer protection differs from official stores — check the shop's rating and refund policy before buying. You can hide keyshop offers at any time with the keyshops toggle. Keyshop prices vs Steam →

How can I get Mainframe Defenders at a discount?

Create a free price alert on this page and KingsPrice will email you when Mainframe Defenders drops below your chosen price. The biggest discounts usually appear during seasonal Steam sales and publisher promotions — the sale calendar on this page shows the next confirmed event.

System requirements

Minimum

Minimum:
  • Requires a 64-bit processor and operating system
  • OS *: Windows 7 or later
  • Processor: Intel Celeron
  • Memory: 2048 MB RAM
  • DirectX: Version 10
  • Storage: 200 MB available space
  • Additional Notes: Requires a 64-bit processor and operating system

Recommended

Recommended:
  • Requires a 64-bit processor and operating system
  • Additional Notes: Requires a 64-bit processor and operating system

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