Subsystem Synth

Every route is a puzzle and a lofi track.

Draw a line from each station to its matching symbol, then hit Play. Route every train home without crashing. When it works, your solution becomes a looping lofi beat.

Play the first three chapters free right here in your browser. The full game is a one-time purchase: download the ZIP, extract it, and open index.html to play locally. No DRM, no installs, no accounts (local save options).

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Small grids with big timing puzzles.

Just because a path connects doesn't mean it's safe. If two trains hit the same dot at the same time, they crash. You'll need to take the long way around, build holding loops, and thread the needle between moving traffic. Later levels introduce mixers, splitters, switches, and stations that mirror your moves.

A puzzle you can listen to.

Each color is a part of the synth: keys, hats, bass, plucks, pads, and bells. Replay a solved board to listen to the track you just built, or export it straight to a WAV file where you can transfer to cassette.

In the full game:

• 164 puzzles: 129 in the main campaign (plus 27 hidden void routes and an 8-board secret chapter).
• Pure logic: No ads, no timers, no lives, no star ratings. Take as many attempts as you want.
• Clean hardware UI: Shape-coded colors for all eyes, light/dark modes, new case colors, and reduced effects settings.
• Standalone: Play offline. Your progress saves locally in your browser or you can download a local file.

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Before you play

The web edition is built for a portrait screen. If you're on desktop, narrow your browser window so it looks like a phone or enjoy the effect of a floating device and ambient lighting.

Transferring your save: The browser demo and the full game run separately, but your progress can carry over. Just use the in-game save export tool in the demo to download your save file, then upload it into the full version. You can also use this feature to routinely back up your game so clearing your browser cache doesn't wipe your progress.

How to play the full version

1. Download and extract the ZIP.
2. Open index.html in Chrome or Edge.
3. Upload your demo save file to pick up right where you left off.
4. Keep the extracted folder in the same place on your computer to keep your local save data intact.