Problems
Topics
Difficulty
Sort by
1
Simple problem
2
Digits
Easy
3
Match’s model
Medium
4
Two circles
Easy
5
Two factors
Medium
6
The vouchers
Hard
7
Roman numerals
Easy
8
Matches
Easy
9
N-digit numbers
Easy
10
Gardener
Easy
11
Big accuracy
Easy
12
Damaged Picture
Easy
13
Spider and Fly
Easy
14
The Ticket Chase
Very easy
15
Mouse and corns
Medium
16
Dragon
Medium
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