One touch, nothing else
No buttons to learn, no menus mid-run. You are playing three seconds after you open it.
free · no ads · no tracking
VOLT_LINE
One finger, five cables, one pulse that never stops. Tap above it to climb, below it to drop. Collect the charges, slip past the blocks, and see how long the circuit holds.
Version — · · Android 6 and later · works in portrait and landscape
How it works
- 1Tap above the pulse to move up, below it to move down. That is the whole control scheme — or switch to swipes, or to two on-screen buttons.
- 2Green charges score points and build a combo. Red blocks end the run, but slipping past one up close pays a bonus.
- 3The faster you go, the more cables open up and the denser the music gets. Level six starts moving the cables themselves.
What is in it
Portrait and landscape
Turn the phone whenever you like. The cables spread out, the HUD moves, the run keeps going.
Music that follows you
The soundtrack is generated while you play: the tempo climbs with your speed and instruments come in as you go. No two runs sound the same.
Fair on every screen
Speed and gaps are measured in time, not pixels. A 120 Hz phone, a tablet and an old handset all give you the same moment to react.
Made to be readable
A colourblind palette that also marks each cable with a shape, a reduced-effects mode, system text size, and vibration you can turn off.
13 languages
The game speaks your phone's language, or whichever one you pick.
Three power-ups
They show up from level two, one at a time, and they are the only help you get.
Shield
Absorbs one hit and burns out. The ring blinks when it is about to expire.
Slow motion
The world slows down without slowing your score. Room to breathe at full speed.
Magnet
Nearby charges bend towards you instead of teleporting: you can see them come.
What it does not do
- No accounts, no advertising, no analytics, no third-party libraries phoning home.
- The only thing it stores is your record and your settings, on your phone.
- It asks for the network only to check for a new version, and only if you leave that on.
- No sound files inside: every note is generated on the fly, which is also why it is small.
Support the project
VOLT_LINE is free and will stay free. If it made a few of your bus rides shorter, a coffee is the whole business model.
Questions
Why is it not on the Play Store?
Because it does not need to be. The APK is signed with the same key for every release, published by an automated build, and the app checks for updates on its own — verifying the checksum before it installs anything.
Is it safe to install an APK from outside the store?
Android will ask you to allow installs from this source, once. The file comes from the public releases repository, and its sha256 is published in the manifest next to it, so you can check the file you downloaded is the file that was built.
Does the browser version save my score?
It keeps your record in that browser, but it is meant as a taste of the game. The app runs smoother, works offline and vibrates.
Are the sources available?
The release repository is public: binaries, manifest and changelog. The game's source tree is private.