The square at the top left opens and closes this overlay: a square while it's shut, a diamond while it's open.

Filled, your moves count: an attempt is on. Empty, they don't.

Hold the cube still for 2.2 seconds and it resets: the colors draw in and the square fills. Touch the cube and they come back on a new scramble. Solve it and the attempt counts: its moves and time show beside qb, and the square stays filled until you turn the cube again.

After a solve, the next hold brings the impossible cube: each of its stickers shows another color from the other side.

During an attempt, a tap on the square only tips it, asking; a second gives the attempt up and leaves the cube as it is; the next opens the overlay. The new scramble scrambles in view, without an attempt.

R right, L left, U up, D down, F front and B back each turn their face a quarter, clockwise as you look at it.

M middle, E equator and S standing turn the middle layers: M the one between L and R, the way L turns; E between U and D, the way D turns; S between F and B, the way F turns.

x, y and z turn the whole cube, the way R, U and F turn.

After a letter, ′ prime turns it the other way, 2 double turns it twice, and w wide turns the middle layer along with the face: R′ is said R prime, R2 R double, Rw R wide.

Moves add up: R and R make R2, R and R′ cancel. Back turns your last move back.

On a keyboard, hold ⌥ option for prime, ⇧ shift for double and ⌃ control for wide as you press a letter; ⌫ backspace turns your last move back.

With ? on, a key shows its move as an arrow instead of making it, for your hand to make.

The cube's values can be changed here.