Visual-Spatial2 min read

How to play Mental Rotation

A shape made of squares, and four or five options. One option is the same shape, only turned. The others are its mirror image, turned too.

Goal

Pick the option that matches the shape by turning alone - without flipping it over.

Look at the shape at the top.
Each option is drawn at a different angle. Turn it in your head until it lines up with the shape.
Pick the one that matches. A mirror image never will, however you turn it.
Shapes grow from 5 squares on Easy to 8 on Expert; from Hard, options can be turned to any angle, not just quarter turns.

Find one distinctive feature in each option first, then check whether a second feature sits clockwise or anticlockwise from it.
On Easy, one option has a square moved - rule it out by counting.
On Easy and Medium, a hint fades a wrong option.

Every correct answer is worth 100 points, scaled by difficulty (Easy ×0.8, Medium ×1, Hard ×1.3, Expert ×1.6).
Answering within 3 seconds adds a 25-point speed bonus.
Each answer in a row adds a 15-point streak bonus, up to 10 in a row.
Using a hint halves the points for that answer and skips the bonuses. Hints are only available on Easy and Medium.
Your score, streak and achievements are saved to your account when the game ends.

Classic

A fixed number of rounds, then a results screen.

Endless

Keep playing until you press Quit.

Time Attack

Fit in as many rounds as you can before the clock runs out.

Survival

Play until you run out of lives or make the game-ending mistake.