Buy Mainframe Defenders Steam Key
Mainframe Defenders Steam Key: compare prices from 14 offers (October 2026)
A Mainframe Defenders Steam Key — also known as a CD Key or digital code — is the official activation code you redeem on Steam and keep in your library permanently. From €0.74 (€1.15 with fees) at Kinguin · 7 verified stores, 14 offers in stock · Updated 30min ago.
Gift cards
Steam Key
Prices change depending on the selected payment method.
Final prices with fees
How much does Mainframe Defenders for PC cost right now?
Mainframe Defenders for PC starts at €0.74 (€1.15 with fees) at Kinguin, a Steam key.
That €0.74 (€1.15 with fees) already includes the OCTGOC10 coupon, so apply it at checkout or the store will show you a higher price.
With 14 offers across 7 stores there is enough competition for the price to move, so the gap between the cheapest and the rest is worth checking before you buy.
Steam Key
Steam Gift
Is it worth buying the Steam Key for Mainframe Defenders now or waiting?
That €1.04 (€1.67 with fees) key is at one of its best prices.
- Those €1.04 (€1.67 with fees) are 77% below what it usually costs, measured on the store price.
- Only 2 stores sell the Steam Key, and with that little competition the price barely moves.
- Not counting today, only 27 days out of the 513 days on record were this cheap or cheaper; the lowest it has ever cost is €1.09.
Worked out from 610 daily records of the Steam Key for Mainframe Defenders across 7 stores. See the full price history.
The price does not include each store's payment fees. The percentage is measured on the store price, without coupons, because that is how we record the history. The analysis only counts Key offers. Shared accounts, Steam Gift and physical editions stay out, because they are not the same product and their prices move differently.
Which Mainframe Defenders format should you buy?
By format: Steam Key from €0.74 (€1.15 with fees), GOG Key from €0.98 (€1.60 with fees) and Steam Gift from €2.82 (€3.67 with fees).
Can you activate Mainframe Defenders in US?
10 of the 14 offers work on US — the Global ones plus the ones issued for your own region.
Why is there such an expensive Mainframe Defenders offer?
One listing is worth ignoring: the Steam key that Key4Games has at €7.98 (€8.54 with fees) is more than 7 times the cheapest offer and is not what this game costs. The number to work from is €0.74 (€1.15 with fees) at Kinguin.
Most common FAQs when buying Mainframe Defenders for PC in digital format:
Other stores may take 30–40 minutes depending on game availability. On release days, delivery times may be slightly longer.
If you notice an unusually long delay, contact the store or us, and we’ll resolve it as quickly as possible.
There have been occasions when those services were overwhelmed, which is why we also offer 24/7 customer support to help resolve any issues or questions.
In any case, we always offer a 100% guarantee, so you won’t have any problems, and if you do, we’ll resolve them as soon as possible.
Need more help? Use our FAQs.
Mainframe Defenders
Is it worth it?
What the press says
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A short and sweet platformer with tons of charm, MainFrames is excellent time all around. Read more
Mainframes is an extremely creative, masterpiece in its art-style and soundtrack and a fairly difficult platformer about a floppy disc on a mission of finding... Read more
MainFrames is, simply, a lovely retro-themed puzzle platformer with humour, challenge, and some brain-straining mechanics to master. While not easy, the satisfying controls and charming... Read more
MainFrames is a short and sweet platformer that manages to pack plenty of challenge and fun into every stage, all while remaining visually striking, engaging,... Read more
Mainframes is beyond doubt an impressive game that looks terrific, sounds fantastic, and handles like a dream. Read more
If I was to call MainFrames a proof of concept, I would be grossly overlooking its stellar presentation of byte-sized platforming as a little floppy... Read more
MainFrames is one of those games that knows exactly what it wants to be—and nails it. It’s glitchy in the best way, fast without being... Read more
Outside of its standout aesthetics, MainFrames is a novel pixelated take on precision platforming and a love letter to both platforming and retro PC Read more
Charming 2D platformer set within the windows and desktop of a PC Read more
Precision platformers don’t necessarily need stories, but once you have experienced them with deeply engaging plots, it’s hard to fully enjoy them without. What MainFrames... Read more
All told, Mainframes is a solid recommendation if you’re after a new precision/puzzle platformer that tries something relatively fresh with its desktop-bending premise. We would... Read more
Ultimately, I’m still a fan of MainFrames, and I think Assoupi and The Arcade Crew have given us a unique and charismatic puzzle platformer experience.... Read more
Mainframes leaves me with an overall impression of muddledness, albeit executed with a sincere passion. It throws in ideas about platforming, collecting, and environmental manipulation.... Read more
So it’s probably pretty weird that I am going to recommend this game with one big fat caveat. If you’re a fan of the genre,... Read more
MainFrames is a delight to look at, but less enjoyable to actually play. The charming and cute aesthetics can't save MainFrames from its simplistic gameplay... Read more
After finishing MainFrames, I felt satisfied. The game doesn't reinvent the wheel, but it's entertaining, and at the end of the day, that's what matters.... Read more
A cute and short platformer about a nostalgic time, the game efficiently entertains and pays tribute to simpler times with a very charming visual style,... Read more
About the game
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