鋼鉄戦記C21

Online robot action RPG with customizable machines and planetary exploration

CyberStep, Inc. · Released Oct 14, 2020

Action Massively Multiplayer RPG Free To Play

Reviews: Mixed; 68% of 138
Recent reviews: Not enough recent
Players: 0; daily peak, Nov 7, 2026
Steam Deck: Unsupported
Last update on Steam: 1 year ago; Nov 6, 2025
Minimum PC: VRAM 64MB; 0.6 GB RAM · 1.2 GB disk; Full requirements

What is 鋼鉄戦記C21?

In this free-to-play, third-person action MMORPG, you explore planets, fight enemies, and earn parts to customize your robot. You join the Neo Angel Force in its fight against the Demon Force, with online co-op and PvP available.

For you if...

+you like assembling robots with parts earned through play
+you want online co-op and PvP robot battles
+you enjoy exploring planets in an action RPG

Not for you if...

−you prefer a fixed character with little customization
−you want an offline action RPG

What players say

68% of 138 reviews are positive

Players praise the robot customization and combat. Their most common complaint is the lack of English support, which makes the Japanese-language game difficult to navigate.

Screenshots and trailer

鋼鉄戦記C21 system requirements

Minimum: VRAM 64MB, 0.6 GB RAM, 1.2 GB of disk space.

As published by the developer.

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Minimum

OS: Microsoft Windows 7 / 8.1 / 10
Processor: Intel Pentium4 1.6GHｚ
Graphics: VRAM 64MB, NVIDIA GeForce4, ATI RADEON 8500
Memory: 640 MB RAM
Storage: 1.2 GB available space
DirectX: Version 9.0c

Does 鋼鉄戦記C21 have co-op or multiplayer?

Yes: co-op online; PvP online; MMO. There is no single-player mode. Crossplay with other platforms is declared.

Does 鋼鉄戦記C21 run on Steam Deck?

Unsupported No: Valve rates it Unsupported on Steam Deck.

Not supported on SteamOS

PC version details

DRM: None declared on Steam
Controller: Keyboard and mouse
Platforms: Windows, macOS
Steam features: Workshop, Family Sharing, In-app purchases
Languages: Full audio: Japanese.

Does 鋼鉄戦記C21 use AI-generated content?

No AI-generated content is disclosed on the game's Steam page.

Self-reported by the developer under Steam rules: it covers AI content that ships in the game, not tools used to make it. Steam page checked on Oct 25, 2026. How to filter AI games on Steam