We offer a walkthrough for "Brain Test 3 Level 9: How can I open that door?".
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Question
How can I open that door?
Hint 1
Tap on the door symbols to change them.
Hint 2
Match the symbols horizontally.
Hint 3
The lever is hidden behind the box.
Hint 4
You need to put the missing lever to open the door.
Images
Answer
Move the box away and put it aside. Then put the red lever to its place on the right side of the door. Now tap on the symbols on the door to match the ones on their left.
Game Versions
Play Brain Test 3
