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Mainframe Defenders

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App ID 1184810
App Type Game
Developer
Publisher Synthetic Domain
Franchise Synthetic Domain, Mainframe Defenders, SZDT
Supported Systems Windows Linux
Technologies Unity Engine
Last Changenumber 31103604
Last Record Update 14 September 2025 – 14:44:13 UTC ()
Release Date 25 February 2020 – 21:42:11 UTC ()
😎 82.36%
729 reviews
4
In-Game
+2
🗺 Exploration 🛡️ Tactical RPG 👻 Traditional Roguelike 👻 Roguelite 🧱 Sandbox

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.

Additional Information

Developer Synthetic Domain
community_visible_stats Yes
ReleaseState released
Publisher Synthetic Domain
Store Release Date 25 February 2020 – 21:42:21 UTC ()
osarch 64
community_hub_visible Yes
Social Media https://bsky.app/profile/syntheticdomain.bsky.social
https://discord.com/invite/d7bvmbJz6h
https://www.facebook.com/gaming/SyntheticDomain
https://www.instagram.com/syntheticdomain
https://www.linkedin.com/company/syntcheticdomain
https://t.me/SyntheticDomain
https://www.threads.net/@syntheticdomain
https://www.tiktok.com/@syntheticdomain
https://vk.com/synthetic_dom
https://x.com/SyntheticDomain
https://www.youtube.com/@syntheticdomain
Primary Genre Strategy (2)
Store Genres Indie (23), RPG (3), Strategy (2)
Steam Release Date 25 February 2020 – 21:42:11 UTC ()
Store Asset Modification Time 25 July 2025 – 15:44:40 UTC () (1753458280)
library_assets
library_capsuleen,zh-cn,zh-tw,ja
library_heroen
library_logoen,zh-cn,zh-tw,ja
library_headerja,zh-cn,en
logo_position ↴
pinned_positionBottomLeft
width_pct49.819990964643864
height_pct74.06354719121876
osextended empty string
name_localized
schinese主机保卫队
tchinese主机保卫队
koreana메인프레임 수비대
japaneseメインフレーム・ディフェンダーズ
frenchDéfenseurs Mainframe
portugueseDefensores de Mainframe
brazilianDefensores de Mainframe
germanMainframe-Verteidiger
polishObrońcy Mainframe'ów
spanishDefensores de Mainframe
italianDifensori del Mainframe
review_score 8
review_percentage 87
Detected Technologies (?) Unity Engine, cURL SDK
Steam Deck Compatibility
  • Steam Deck:
  • Some functionality is not accessible when using the default controller configuration, requiring use of the touchscreen or virtual keyboard, or a community configuration
  • This game sometimes shows mouse, keyboard, or non-Steam-Deck controller icons
  • Some in-game text is small and may be difficult to read
  • This game's default graphics configuration performs well on Steam Deck
  •  
  • SteamOS:
  • This game runs successfully on SteamOS
  • Note: Some functionality is not accessible when using the default controller configuration, requiring use of the touchscreen or virtual keyboard, or a community configuration
  •  
  • category: Playable
  • steamos_compatibility: Compatible
  • test_timestamp: 14 August 2025 – 00:00:00 UTC
  • tested_build_id: 8953278
  • configuration:
    supported_inputother
    requires_manual_keyboard_invoke0
    requires_non_controller_launcher_nav0
    primary_player_is_controller_slot_00
    non_deck_display_glyphs1
    small_text1
    requires_internet_for_setup0
    requires_internet_for_singleplayer0
    recommended_runtimenative
    requires_h2640
    requires_voice_files0
    gamescope_frame_limiter_not_supported0
    hdr_support0
controllertagwizard Yes
First seen on SteamDB 26 October 2019 – 03:25:29 UTC (), in changelist #7093814

Supported Languages

13 Languages Interface Full Audio Subtitles Achievements
English Yes Yes Yes
Russian Yes Yes Yes
Hungarian Yes Yes Yes
German Yes Yes Yes
Portuguese - Portugal Yes Yes Yes
French Yes Yes Yes
Italian Yes Yes Yes
Spanish - Spain Yes Yes Yes
Polish Yes Yes Yes
Simplified Chinese Yes Yes Yes
Korean Yes Yes Yes
Japanese Yes Yes Yes
Portuguese - Brazil Yes Yes Yes

Tags

🗺 Exploration 🛡️ Tactical RPG 👻 Traditional Roguelike 👻 Roguelite 🧱 Sandbox 👻 Roguelike 💡 Strategy 🎲 RPG 🏽 2D 🤖 Mechs 🌆 Isometric 🛡️ Turn-Based Combat 🔀 Procedural Generation 👾 Pixel Graphics 🪖 Military ☯ Minimalist 🌫 Atmospheric 🌆 Futuristic 📼 1990's 🎸 1980s

Categories

Single-player Steam Achievements Steam Trading Cards Family Sharing

Accessibility Categories

Adjustable Text Size Custom Volume Controls Playable without Timed Input Keyboard Only Option Mouse Only Option Touch Only Option Adjustable Difficulty Save Anytime

Assets

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page_background_pathapp/1184810
raw_page_backgroundpage_bg_raw.jpg
timestamp16 October 2025 – 15:19:23 UTC

Trailer 364630 ↴

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timestamp 8 May 2021 – 20:18:19 UTC

Trailer 364635 ↴

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all_ages true
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timestamp 8 May 2021 – 20:18:27 UTC

Trailer 364629 ↴

trailer_name Gameplay
trailer_category 0
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all_ages true
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timestamp 24 April 2021 – 16:23:14 UTC

Steam charts

  • 4 players right now
  • 41 24-hour peak
  • 1,256 all-time peak 18 March 2025
SteamDB.info

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Store data

Twitch stats

  • 0 viewers right now
  • 0 24-hour peak
  • 1,282 all-time peak
  •  

Owner estimations

Monthly players breakdown

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Steam hub followers history

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User reviews history

  • 😎 Very Positive
  • 82.36% SteamDB Rating
  • 638 87.5% positive reviews
  • 91 12.5% negative reviews

Sign in to see reviews chart.

Markers

Date Label 30-day Peak
25 February 2020 Steam Release -
3 July 2024 🆓 Free key giveaway -
3 September 2025 ⇄ Indiegala: Pixel Syndrome Bundle -

Suggest new noteworthy markers in our Discord #forum.

How many players are playing Mainframe Defenders right now on Steam?

Steam player counter indicates there are currently 4 players live playing Mainframe Defenders on Steam.

Mainframe Defenders had an all-time peak of 1256 concurrent players on 18 March 2025.

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