Mainframe Defenders
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About Mainframe Defenders
Mainframe Defenders is a tactical strategy game set in the “Stargazer” research complex, where a computer virus has taken control of most robotic units. You lead a squad of four prototypes to defend the complex’s Mainframe and push into its deepest areas.
Missions in Stargazer
You repel assaults, destroy unit fabricators, download valuable data and clear infected nodes. Missions combine different objectives with unique conditions, and their levels pair hand-made rooms with procedural generation. You can accept the challenge of the unknown or avoid it and risk falling behind.
Build your squad
Combine items with unique abilities to create powerful squad builds. Items have limitations and drawbacks, which you can work around or build upon. Victory or defeat, you can unlock new units with their own upgrades and load-outs, as well as new items for developing further strategies.
Tactical combat
You can overheat enemies, damage them with corrosion, absorb attacks and return fire, bury opponents under bullets, eliminate them with a powerful shot or disable them with debuffs. Enemy units have distinct roles and are designed to counter particular strategies, so you need to choose targets carefully and avoid relying too heavily on one approach.
Retro presentation
The graphics take inspiration from 1980s terminal PCs, accompanied by a synthwave soundtrack.
Frequently asked questions
The best price for Mainframe Defenders is $0.59 at Humble Store. That is 86% less than on Steam, where it costs $4.48. 8 shops have an offer that activates in your country.
Some are. This page only shows offers that activate in your country; offers for other regions, or with no stated region, are left out. To see the offers for another country, change your country at the top of the page.
That depends on the offer: each offer in the list shows the launcher its key is for. Redeem the key on that launcher and Mainframe Defenders stays in your library for good.
Yes, with a small risk. Publishers create keys to sell in other shops, which is why a key can cost less than in the official store, and once you activate it the game is yours to keep, just like a store purchase. On average 1–2% of keys fail, so check the shop's buyer protection before you buy: the official store does not refund keys bought elsewhere.
The minimum requirements for Mainframe Defenders are: Windows 7, Intel Celeron, 2 GB RAM, 200 MB storage. It runs on Windows only. The recommended specs are in the System requirements section.
No. Mainframe Defenders is a single-player game.
Mostly, yes. Valve rates Mainframe Defenders as Playable on the Steam Deck: it runs, but may need some manual setup.
Buy Mainframe Defenders 86% cheaper than on Steam.
Mainframe Defenders is available for 86% less in shops such as Humble Store, Kinguin, or Eneba.
Steam lets publishers create keys to sell in other shops. Once you activate a key, the game is yours to keep, just like a store purchase.
Disclaimer: CD keys have an inherent 1–2% average failure rate. Check the shop terms for buyer protection info. Steam offers no buyer protection for keys bought in other shops and doesn't refund them.











