Which is a winning combination of digits?

The computer chose a secret code (sequence of 4 digits from 1 to 6). Your goal is to find that code. Black circles indicate the number of hits on the right spot. White circles indicate the number of hits on the wrong spot.
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Correct Answers: 
5
Points: 
6

Calculate 256 + 256

FUNNY MATH: Calculate 256 + 256 :)
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Correct Answers: 
11
Points: 
3

What hides this 3D image?

Stereogram - 3D Image
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Correct Answers: 
62
Points: 
1

Calculate the number 290

NUMBERMANIA: Calculate the number 290 using numbers [3, 5, 6, 4, 20, 320] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
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Correct Answers: 
3
Points: 
8
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