Music

Fold Rhythm

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Fold Rhythm turns your phone into a rhythm instrument. The wave on screen is the line your hinge has to draw: fold when an orange note arrives, open when a blue one does. The music and notes are generated by code inside the game; the goal is to hit as many notes as possible right on time.

How to play

Put the phone flat open on a table and press ⟲ 180°.
Fold when an orange note reaches the line, open when a blue note does.
For long bar notes, keep the phone folded until the bar ends.
Your own movement shows up as a white trail; try to make it run over the notes.
On a touch screen, pressing counts as folding and releasing counts as opening.

Tips

You don't need a big movement: a short, crisp fold of 10–20 degrees is enough. Big movements make you late.
If you are always late, increase the latency setting on the start screen. While you play with the sensor, the game also adjusts the latency itself from your average timing error.
Focus on the music rather than the screen; the beats come in time with it.
Leaving the bottom half of the phone on the table makes your movement steadier.

Why does latency matter?

Phones' motion sensors, screens and speakers all have different delays. The same movement can look on time on one phone and late on another. The latency setting closes that gap. It is saved on your phone, so once it is right you don't have to adjust it again.

What do you need?

Katla games run in the browser; there is nothing to download or install. The games read the phone's fold angle from its motion sensor, so they play best on foldable phones such as the Galaxy Z Fold and Z Flip. On a phone that doesn't fold you can tilt the phone with your wrist instead of moving the top half, and most games can also be played by tapping the screen. Motion sensors only work over a secure connection (https).

Fold Rhythm

How to play

Tips

Why does latency matter?

What do you need?

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