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: 
13
Points: 
1

Find the area of the shaded figure

Express result to the accuracy of 3 decimal.
Category: 
Correct Answers: 
39
Points: 
1

Detect text from stereogram

Stereogram - 3D Image
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Correct Answers: 
113
Points: 
1

What a winning combination?

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.
Category: 
Correct Answers: 
4
Points: 
7

What number comes next?

Look at the series (24, 83, 22, 56, 81), determine the pattern, and find the value of the next number!
Category: 
Correct Answers: 
17
Points: 
1
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