Wind-up Car is about the pull-back toy cars you wind up by dragging them backwards. You wind the spring by folding and opening the phone; when the time is up the car is released and rolls across the table. The aim is to stop it as close as possible to the flagged line without winding it so far that it drops off the table.
How to play
- Put the phone flat open on a table.
- Fold and open, fold and open: each fold pulls the car back a bit more and winds the spring. The more and deeper you fold, the further the car goes.
- The first fold starts a 5-second timer. When it runs out, the car is released.
- Stop the car as close to the flagged line as you can.
Tips
- The spring doesn't wind linearly: the first folds give a lot of power and later ones less and less. If the target is close, two or three deep folds may be enough.
- The spring's range is only shown during the first practice round. Use that round to learn the feel.
- The surface changes: the car goes a short way on carpet, a medium way on wood and a long way on glass. Check the surface every round.
- Only the folding direction winds the spring; there is no need to rush when opening.
How does the spring work?
How much the spring winds is calculated from the total folding motion along a curve that gradually levels off, so you can't wind it forever, but the last few folds are perfect for fine adjustment. Once released, the spring's energy is spent against the friction of the surface. The same winding means a short trip on carpet and a long one on glass.
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).
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