Brain Test 4 Level 209
What should come on the position of the question mark Answer
The answer is 131. You should turn your phone upside down and then look at the blackboard.
Follow the screen sequence
Use the images as a compact replay of the solving path. The text below each frame explains what should change.
Video walkthrough
Same number in other versions
Brain Test versions can reuse the same level number with a different puzzle. If the screenshot or question does not match your game, switch to the same number in another version or use the nearby level links.
Strategy guide
- 1.Turn your device upside down to view the blackboard from a different perspective;
- 2.Read the numbers on the blackboard when rotated 180 degrees to see '131';
- 3.Ignore conventional math and focus on visual trickery with device orientation.
Common mistakes
- 1.Trying to solve the math problem directly without noticing the upside-down hint;
- 2.Looking at the blackboard right-side up and missing the number pattern;
- 3.Assuming the question mark represents a missing number in a standard sequence.
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