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Problems

Topics
Difficulty
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1
Simple problem
Very easy
2
Digits
Very easy
3
Match’s model
Medium
4
Two circles
Easy
5
Two factors
Medium
6
The vouchers
Easy
7
Roman numerals
Easy
8
Matches
Easy
9
N-digit numbers
Easy
10
Gardener
Very easy
11
Big accuracy
Easy
12
Damaged Picture
Easy
13
Spider and Fly
Easy
14
Rabbit-failure
Very easy
15
Mouse and corns
Very easy
16
Dragon
Easy
17
Gardener-painter
Easy
18
Paint2D
Medium
19
Degree of symmetry
Very easy
20
How many times to repeat?
Easy
21
Corruption
Hard
22
"Mirror prime" numbers
Easy
23
New-year tree
Medium
24
Paint2D-Crack
Hard
25
Paint3D
Easy
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