Mental Rotation
Is the right shape a rotation of the left, or its mirror? 20 trials, 10 seconds each.
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About this game
Mental Rotation is a classic spatial-reasoning task used in IQ research since the 1970s. Two polyomino-style block shapes appear side by side: the left one is the reference, and the right one has been rotated by 0Β°, 90Β°, 180Β°, or 270Β°, then sometimes flipped horizontally. Your job is to choose Same (rotation only) or Mirror (flipped) within ten seconds.
Each run gives you twenty trials. Correct answers earn 100 points, scaled up to 1.5Γ at a 5-streak combo and 2Γ at a 10-streak combo. Wrong answers cost 50, and time-ups cost 25. Difficulty escalates: trials 1-5 use 3-block shapes, 6-12 use 4-block shapes, and trials 13-20 use 5-block shapes.
Strategy tips
Do not try to rotate the whole shape in your head β that is much slower than necessary. Instead, pick a unique corner block (an L-bend or a long arm) and trace where it ended up. If the corner can be reached by rotation alone, the answer is Same. If it would require a flip, the answer is Mirror.
Symmetric shapes are filtered out automatically by the puzzle generator, so every trial has a definitive right answer. Watch out for 180Β° rotations β they look like a flipped version at a glance but are still rotations, so the answer there is Same.