A partial shape on each half. At the right angle they complete one figure.
Fold the phone.
Solve the puzzle.
Each puzzle is spread across both halves of the screen. Bend the device and the far half folds onto the near one, so shapes meet, walls arrive, and light crosses the crease at whatever angle you hold.
- 1 Flat: tap a piece, then a dashed square, to move it
- 2 Fold: drag the board and watch the grey shape land
- 3 Commit: tap the lower half to lock it in
Or use these. Notch 0 of 7 — on an iPhone that does not fold, this control is what you get, and every puzzle is solvable with it.
Hint:
That is the real game running in your browser — the same rules, the same level files, the same eight-position fold. The app has the paper, the sound and the haptics. If you are wondering what is actually doing the bending, here is the device.
What the hinge gives you
A phone that opens, and holds
the angle you left it at.
iPhone Duo opens into an inner display about the proportions of a small paper page, split across two halves. The hinge between them reports its angle continuously — not open or shut, but every position in between.
Two words matter: absolute and unsprung. Absolute, because it is wherever you put it rather than wherever you last swiped. Unsprung, because it stays there when you stop pushing — which is what lets a puzzle ask which angle and expect an answer you can hold while you think.
A touchscreenEvery phone
Forgets the instant you lift your finger.
TiltEvery phone
Drifts, and the whole device has to stay still.
The hinge angleiPhone Duo
Stays exactly where you set it, while you read the board.
Crease does not read the angle as a number. The working range is cut into eight notches with a hysteresis band, so the game only ever sees a whole number from 0 to 7 — which is why a hand that shakes, a sensor that is coarse and a device resting a little short of flat all behave identically.
Sixty puzzles
One idea, built up five ways.
Four acts. Every verb is introduced by a level that cannot be failed, and none of them is ever explained in words.
Walls ride the fold and land somewhere new at every angle. Some arrivals are in the way.
A beam crosses the crease at an angle the fold chooses. This is the verb where the angle is the answer.
A token attaches to the far half and rides across. Where it lands is which angle you chose.
The fold reflects instead of translating, so the piece for the left mark starts on the right.
From level eight the verbs combine. No new idea after that — just depth.
Plainly
Two things worth saying
before you buy it.
About your hinge
Crease uses small partial folds and never asks you to close the device. Finishing all sixty levels takes about two hundred gentle bends, spread over several hours — a couple of days of normally opening a folding phone. Nothing in the game rewards folding faster or more often — there are no timers, no scores and no streaks, because a puzzle rewards thinking between folds.
That is a fact about the game, and it is the only kind of claim worth making: nobody has published a fold-cycle rating for this hardware, so we do not say anything about what it tolerates.
You do not have to fold at all
If you would rather not bend your phone, or you do not own a folding one, an eight-position control on screen does exactly the same job — the one you have been using above. It is not a lesser mode: it drives the identical code, and every one of the sixty puzzles is completable with it, which an automated test in the build checks.
There is also a Gentle setting that keeps all eight positions and narrows the travel, so a smaller bend reaches every one of them.
$2.99, once.
No ads. No in-app purchases. No currency, no hints for sale — hints are free and always there. No accounts, no sign-in, no analytics, no data collected, nothing sent anywhere. The app has no networking code in it at all. Works offline, on a plane, forever.
A control no phone has had before,
with something to do.
Crease arrives with iPhone Duo on 23 October.