What hides this stereogram?

Stereogram - 3D Image
Category: 
Correct Answers: 
119
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: 
9
Points: 
2

Find the area of the shaded figure

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

Calculate the number 619

NUMBERMANIA: Calculate the number 619 using numbers [3, 2, 8, 5, 15, 75] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Category: 
Correct Answers: 
3
Points: 
8

Find the right 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: 
2
Points: 
9
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