Mainframe Defenders: Steam price vs key
Mainframe Defenders costs €2.02 as a key at BuyCheapKeys, versus a regular price of €4.90 on the Steam Store: you save €2.88 (59% less). The key activates on your Steam account and it's exactly the same game (prices from October 4, 2026).
- Instant deliveryKey by email and in your account
- Full guaranteeReplacement or refund
- Secure paymentCard, PayPal, Google Pay, Apple Pay
- Activates on SteamSame game in your library
- Up to 4% cashbackWith the VIP Club
Should I buy Mainframe Defenders now? A steal: buy it now
The key costs €2.88 less than the regular Steam price and is at its lowest recorded price. With 87% positive reviews, it's a safe buy.
Price score: 10/10 · The key is 59% below the regular Steam price.
The same game, for less
A Steam key gives you exactly the same as buying on Steam. Only the price changes.
Available Mainframe Defenders keys
2 offers, sorted by price
Mainframe Defenders price history
- Steam regular price€4.90
- BuyCheapKeys key€2.02
We've been tracking this game since October 3, 2026. The chart will appear once there are a few days of data.
How to activate the Mainframe Defenders key
- 1
Buy the key
Choose the Mainframe Defenders offer and pay. You get the key instantly.
- 2
Open Steam
Go to “Games” › “Activate a Product on Steam”.
- 3
Redeem and play
Paste the key and the game stays in your library forever.
Mainframe Defenders FAQ
›How much is Mainframe Defenders on Steam?
The regular Steam price of Mainframe Defenders is €4.90. At BuyCheapKeys the Steam key costs €2.02, €2.88 less.
›Where to buy Mainframe Defenders cheapest?
The cheapest option is the BuyCheapKeys Steam key for €2.02, 59% below the regular Steam price. Instant delivery and it activates on Steam.
›Is the Mainframe Defenders key the same game as on Steam?
Yes. When you redeem the key, Mainframe Defenders is added to your Steam account with achievements, cloud saves and updates, just as if you bought it on Steam.
›What is the lowest price for Mainframe Defenders at BuyCheapKeys?
The lowest recorded price for the key at BuyCheapKeys is €2.02 (October 4, 2026). Today it costs €2.02.
›Will the Mainframe Defenders key work in my country?
We list Global and Europe region keys. Each BuyCheapKeys product page tells you whether it can be activated in your country before you buy.
›Is it safe to buy from BuyCheapKeys?
Yes. Delivery is instant by email and in your account, we accept card, PayPal, Google Pay and Apple Pay, and every purchase is covered by a replacement or refund guarantee.
›Does Mainframe Defenders work on Steam Deck?
Valve rates it “Playable” on Steam Deck. Once the key is activated on Steam you can play it on Steam Deck just like on PC.
›Is Mainframe Defenders worth it?
It has 87% positive reviews out of 725 on Steam (“Very Positive”), was released in 2020 and is developed by Synthetic Domain. Genres: Exploration, Tactical RPG, Traditional Roguelike, Roguelite.
Games like Mainframe Defenders, cheaper as a key
-64% vs Steam RRPLords of Ravage
-34% vs Steam RRPSeer's Gambit
-48% vs Steam RRPMolten Horn
-44% vs Steam RRPBlue Prince
-86% vs Steam RRPMoon Hunters
-27% vs SteamLegend Creatures(传奇生物)
Mainframe Defenders
€2.02