
Screenshots

Watch trailer on Steam ↗Engine Of Sin
Swimming Scorpions · Published by Swimming Scorpions · Official site ↗
Content notice: This game contains violence, brutal imagery, war-related themes, depictions of injuries and medical procedures, drug and alcohol use, and occasional profanity. No sexual content or nudity is included.
Last updated 28 Sept 2026
Operate a titanic war machine from the perspective of its last surviving crew member in a desperate battle against the otherworldly Kaiju. Balance power levels, craft specialised ammunition, and feed your ever-hungry reactor ⟹ yet the greatest horror may already be sealed within your metal coffin.
Action, Indie, Simulation · More free games
Control the last crew member aboard Engine of Sin's titanic war machine, navigating its corridors as you craft specialized ammunition and delicately manage an ever-hungry reactor. In this intense action and simulation game from Swimming Scorpions, every decision could seal your fate or turn the tide against the otherworldly Kaiju.
About this game
Engine Of Sin is a first-person mech simulation game where you pilot a colossal war machine against world-ending Kaiju. Manage your reactor, reroute power between critical systems, salvage the ruins of Earth, and fire apocalypse-grade weapons in battles of epic scale.

Operate the Titanic Mech
Alone inside a towering war machine, you are the last surviving member of its crew. Learn to master every system and turn your metal coffin into the ultimate weapon.
Vent reactor overloads before they trigger a catastrophic meltdown. Redirect power between shields, weapons, and life support. Adjust movement stabilisers, route ammunition feeds, and keep failing systems running in the middle of fierce combat.
Battle the Kaiju
The monsters that ended the world are coming for you.
Each Kaiju is a unique nightmare, with distinct abilities, attack patterns, and weaknesses. Adapt your tactics, exploit vulnerabilities, and choose the right arsenal before it tears through your armor or shatters your mind.
Explore and Rearm
Between battles, you venture into the ruins of the scorched Earth, driven by an oath to uncover the weapon that could finally take revenge on the Kaiju.
Salvage what remains of the old world, forge specialized munitions, recover forgotten technology, and undertake perilous missions to prepare for the next battle.
Uncover the Secrets
Dare to unlock the sealed chambers of your war machine.
Descend into its metal entrails, uncover the fate of your crew, and confront the presence that lives within. Will you cling to your humanity, or merge with the Engine of Sin?

Key Features
✔ Titanic Mecha Simulator – master the systems of an apex war machine
✔ Epic Battles with the Kaiju – adapt your tactics and unleash overwhelming firepower
✔ Grimdark Aesthetics – experience horror through 90’s-inspired FPS visuals
✔ Walking Fortress – explore the four floors of your mech, including crew chambers, weapon altars, medical units, and reactor bay
✔ Explore the Desolate World – scavenge the ruins of various biomes and earn new materials and technology
✔ Titan-Class Arsenal – wield 8 massive weapons, including the Multi-Ordance Siege Cannon, Plasma Purge Incinerator, and the Godbreaker Lance for close-range destruction
✔ Multiple Endings – your choices decide how the story unfolds
System Requirements
Will my PC run this? →Minimum
- OS: Requires a 64-bit processor and operating system
- Memory: 4 GB RAM
- DirectX: Version 11
Supported Languages
*languages with full audio support
Latest news
Press Coverage
This indie horror game is the closest we've got to a Warhammer 40k Titan simulator
Engine of Sin is a new entry in the as-yet-unnamed genre of hybrid simulator / horror games popularized by 2022's Iron Lung: games where the player pilots a terrifyingly complex vehicle, contending with industrial controls spread across multiple stations while trying to survive an even worse outside threat. The new game, by two-person team Swimming Scorpions, puts the player in the command deck of a walking war engine - a cross between a Pacific Rim Jäger and a Warhammer 40k Titan. Game designer and programmer Maciej Machowicz was happy to talk with Wargamer about the game's development, what players can expect, and why he's so damn obsessed with Mecha. Read the full story on Wargamer: This indie horror game is the closest we've got to a Warhammer 40k Titan simulatorRead full article on Wargamer.com






