Mainframe Defenders: Meltdown - Prologue is a free version of the turn-based tactical game Mainframe Defenders with a focus on interesting items and customization. Combine upgrades and collected loot to protect the Stargazer complex.
All Reviews:
Positive (30) - 96% of the 30 user reviews for this game are positive.
Release Date:
Jun 2, 2021

Sign in to add this item to your wishlist, follow it, or mark it as ignored

Check out the entire Synthetic Domain franchise on Steam

Play Mainframe Defenders: Meltdown - Prologue

Free To Play


“Mainframe Defenders is a slick, simple tactical roguelite”
PCGAMER / Jonathan Bolding

“Make sure to add this to the list of the best games of 2020”
Rubberchickengames / ANDRÉ MARRUCATE

“Very Positive”
96,7 – STEAM


Join our Synthetic Domain to stay informed about updates for Mainframe Defenders. There you can share feedback and suggestions, as well as chat with our team about the next project.


About This Game

Mainframe Defenders: Meltdown - Prologue is a free introductory version of the retro-futuristic tactical game Mainframe Defenders. Command a squad of 4 prototypes to protect the Mainframe from infection by an unknown virus. You will have to fight off assaults, destroy fabricators, download valuable data, clear infected nodes, and much more on your way to the deepest areas of the complex. Bypass the limitations and disadvantages of items and create powerful combinations. Destroy opponents with a variety of tactics: overheat them, destroy them with corrosion, absorb damage and shoot back.Don't rely on a single strategy - enemies may have a way to counter it. The Prologue content:

  • 6 of 24 mechs,
  • 90 of 190 items,
  • 1/3 of missions (1 act).

* 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.

Synthetic Domain is a small team of hobbyists with a passion for making games. We are working with limited resources to deliver quality games focusing on polish and execution. We look at indie games, games from the 90s and 00s for our inspiration, hoping to bring some of the spirit of this era to the modern age.

Meltdown - this is not just an addition, but the love of all players who saw a lot of interesting things for fixes. Of course, a pinch of our flaws is present. A complete list of fixes and added content can be found here: Meltdown v1.3

Do not hesitate to contact us if you have any problems, you want to leave a review or a suggestion: Synthetic Domain

System Requirements

SteamOS + Linux
    • 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
    • Additional Notes: Requires a 64-bit processor and operating system
    • OS: Ubuntu 14.04 LTS
    • Processor: Intel Celeron
    • Memory: 2048 MB RAM
    • Storage: 200 MB available space
    • Additional Notes: Requires a 64-bit processor and operating system
    • Additional Notes: Requires a 64-bit processor and operating system

More from Synthetic Domain

Customer reviews

Review Type

Purchase Type


Date Range
To view reviews within a date range, please click and drag a selection on a graph above or click on a specific bar.

Show graph

Filter reviews by the user's playtime when the review was written:

No minimum to No maximum
Display As:
Show graph
Hide graph
Excluding Off-topic Review Activity
There are no more reviews that match the filters set above
Adjust the filters above to see other reviews
Loading reviews...