Find one corner of the target that sticks out in an odd way, then look for that corner in each option. Turning the whole shape in your head is the slow way.
Mental rotation test — free spatial reasoning test in your browser
A block figure sits at the top of the screen. Below it are four more. Exactly two of the four are that same figure, turned; the other two are its mirror image, also turned. Tap the two that match. You get sixty seconds, and a wrong pair costs you three of them.
The figures are generated fresh every trial, so there is nothing to memorise and no set of answers to learn. They also get harder as you go: the shapes gain cells and the turns stop being tidy right angles. Free, no download, and it works the same with a thumb as with a mouse.
How to play
- Look at the target at the top. Every option below is either that shape turned, or its mirror.
- Tap two options. Tapping a selected one again deselects it, so a slip costs nothing until you commit the second pick.
- Both right scores a point and deals a new figure straight away.
- A wrong pair costs 3 seconds, and the correct answers are shown for a moment before the next figure — so a mistake teaches you something.
- On a desktop the number keys 1 to 4 select the options.
- Your score is correct trials in 60 seconds, and your top 5 is kept on this device.
Why the answer arrives slower the further the shape is turned
In 1971 Roger Shepard and Jacqueline Metzler ran an experiment that has been repeated in psychology classes ever since. They showed people pairs of block figures and asked a single question: same shape, or mirror image? The finding was not that people could do it. It was how they did it. The time taken rose in a straight line with the angle between the two figures. Twice the rotation, twice the extra time, right through to 180 degrees.
That linearity is the interesting part, because it is what you would expect if people were actually turning something at a roughly constant rate rather than comparing lists of features. It is one of the more concrete pieces of evidence that visual imagery behaves in some ways like vision, and it is why "mental rotation" is a phrase at all.
The paper-and-pencil version most people have taken is the Vandenberg and Kuse test from 1978, which is where the format on this page comes from: one target and four alternatives, two of them correct. Note what that format does. Because you must pick both matches, you cannot get credit for spotting one and guessing; and because the two wrong answers are mirrors rather than different shapes, you cannot answer by counting blocks. Every wrong option has exactly the same number of cells and exactly the same outline lengths as the right ones. Only the handedness differs.
The practical advice, and it really does work: stop rotating the whole figure. Pick one distinctive feature of the target, usually a limb that comes off the body at an odd place, and check only whether that feature turns the same way around the shape in each option. Handedness survives rotation, which is the entire trick. People who are fast at this test are almost never rotating faster than everyone else. They are rotating less.
Worth saying plainly: this is a game, not an assessment. Scores on spatial tests move around with screen size, with whether you are using a thumb, and with how much sleep you had. Race your own best and leave it there.
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