Hmmsim Metro

Hmmsim Metro

Early access since Jun 2021

Line 1, the most complicated subway in Seoul, is now coming in PC version. You can feel high immersion with the graphics that realize the actual Seoul scenery, the train driving sound, and the realistic train driving system. Experience the operation of the Seoul subway!

91% positive · 1,860 reviews
Not yet
In early access, still in active development
Medium confidence
Active Development
Not yet
In early access, still in active development
Medium confidence
Active Development

Where to buy

Steam $19.99
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Evaluation

Hmmsim Metro has been in Early Access since June 25, 2021 and remains so today — the Steam Early Access flag is still active, and no 1.0 launch announcement has been made. The developer, Jeminie Interactive (a solo developer), has maintained a consistent pattern of substantial updates throughout the game's life. Since late 2024, the following major updates have shipped: - December 31, 2024: A large structural update extending the line to Anyang Station, adding 38 new scenarios, a timetable mode, overhauled AI trains, reworked signals, traffic, and extensive visual improvements. - February 1, 2025: Line extended to Gwangmyeong Station with shuttle trains added. - February 23, 2025: Further extension to Gwangmyeong Depot and old livery trains re-added. These were followed by a series of significant feature patches: - September 21, 2025: Complete train circuit redesign, first-person cab walking, Arduino controller support, and performance improvements. This post explicitly noted that fault-handling features would "be added in the future." - November 29, 2025: Weather system with eight weather types, wheel slip/slide physics, and wiper functionality added. - January 29, 2026: Moving passengers and platform CCTV added. - February 28, 2026: Ray tracing support, a new viewing mode, full engine upgrade (Unreal Engine updated after two years), DLSS 4 and FSR 4 support. As of today, October 1, 2026, the most recent developer communication was the February 28, 2026 feature patch. That represents approximately seven months of silence from the developer. The historical pattern of major updates has typically seen releases every one to three months, meaning the current gap is longer than usual — but the game is still in Early Access with no completion statement, and the September 2025 post explicitly promised future fault-handling content. There is no indication from the developer that development has concluded or that a 1.0 release is imminent.
Evidence
Ray tracing, viewing mode, full engine upgrade, DLSS 4 and FSR 4 support added. Last developer communication as of October 1, 2026.
news post · Feb 28, 2026 source development ongoing
high
Moving passengers and platform CCTV added. Developer notes limitations of solo development for further passenger improvements.
news post · Jan 29, 2026 source content shipped
high

Media

Details

Publisher
Jeminie Interactive
Achievements
—
Platform
Windows
Controller
—
Steam Deck
Playable
Players
Single-player

About this game

Line 1, the most complicated subway in Seoul, is now coming in PC version.

You can feel high immersion with the graphics that realize the actual Seoul scenery, the train driving sound, and the realistic train driving system.

Experience the operation of the Seoul subway!

Hmmsim Metro covers the section between Kwangwoon Univ to Anyang/Gwangmyeong (about 43km, 30 stations), the core of Seoul Subway Line 1.

This section is divided into a similar ratio between the ground and the underground section, so you can enjoy various experiences.

PSD, position indicator, and ATS signal are also implemented to provide even more interest.

The train cab is also implemented similarly to the real world.

Hmmsim Metro has DSD (driver alert), so you should focus more on driving.

Switch AC-DC between direct-to-transfer in the section where the voltage changes, and run the train while controlling the speed according to the ATS signal.

Hmmsim Metro comes with several diagrams.

You can enjoy various trains and realistic scenery changes as time passes and even operate the 'hidden train'.

Last evaluated Oct 1, 2026
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