Which number should replace the question mark?

FUNNY MATH: Which number should replace the question mark?
Category: 
Correct Answers: 
3
Points: 
10

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.
Category: 
Correct Answers: 
3
Points: 
8

Find the right combination

Category: 
Correct Answers: 
7
Points: 
4

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: 
1
Points: 
10

What hides this 3D image?

Stereogram - 3D Image
Category: 
Correct Answers: 
68
Points: 
1
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