Rotating Hexagon 
600 
3 
Geometry,
Combinatorics

Air MF 
500 
6 
Combinatorics

Sum of four 
100 
444 
Combinatorics,
Digits

Money date 
100 
337 
Combinatorics,
Probabilities

Pencils 
400 
7 
Combinatorics

C Sum 
300 
124 
Algebra,
Combinatorics,
Formulas

Lin the Racoon's Debut 
600 
18 
Combinatorics,
Raccoon

Convex triangle 
400 
39 
Geometry,
Combinatorics

Teleporting button 
300 
18 
Combinatorics,
Probabilities

2020 Palindromes 
100 
396 
Combinatorics,
Palindromes

Friendly Team 
400 
12 
Combinatorics

!Fancy sequence 
600 
8 
Combinatorics,
NumberTheory

These Triangles 
300 
22 
Geometry,
Combinatorics

Bingo! 
200 
162 
Combinatorics,
Probabilities

Friendly rooks 
200 
167 
Combinatorics,
Chess

Where is my husband 
500 
23 
Combinatorics,
TrueFalse

Lin Jumper 
500 
15 
Combinatorics

Unfair Game 
400 
31 
Combinatorics

Bools and cows 
200 
165 
Random,
Combinatorics

Obtuser 
400 
19 
Combinatorics,
Geometry

Lin's Octagon 
300 
45 
Combinatorics

Circled 
700 
13 
Geometry,
Combinatorics

Switchers 
400 
44 
Combinatorics,
Sets

Reverse Product 
400 
36 
Combinatorics,
NumberTheory

Total inversion 
500 
31 
Combinatorics,
Geometry

!Fancy grid 
700 
9 
Combinatorics,
Graphs

More dominos 
400 
31 
Combinatorics

Simple expression 
300 
84 
Algebra,
Combinatorics

Equilateral Triangles 
200 
218 
Combinatorics,
Grids

Monochromatics 
400 
6 
Combinatorics,
Graphs

Zeros and Ones 
300 
25 
Combinatorics

Number Coloring 
400 
22 
Combinatorics

Big set 
400 
15 
Combinatorics

Love Triangle 
400 
6 
Combinatorics

Again these rooks 
600 
58 
Combinatorics,
Boards

Subsets Collection 
600 
27 
Combinatorics,
Sets

Difference of squares 
200 
51 
Combinatorics,
NumberTheory

Random numbers 
400 
17 
Algebra,
Combinatorics

Divisible sets 
300 
6 
Combinatorics

0,1,2 polynomial 
400 
20 
Combinatorics,
Algebra

Probability computer 
300 
37 
Combinatorics

Fill the square 
400 
16 
Combinatorics,
Algebra

Sum probability 
300 
83 
Combinatorics,
Algebra,
Probablilities

Almost fixed 
400 
14 
Combinatorics,
Algebra

Math lesson 
400 
41 
NumberTheory,
Combinatorics

Soccer Game 
500 
11 
Combinatorics

Quadratic Sets 
400 
9 
Combinatorics,
Sets,
Algebra

Independence 
300 
10 
Combinatorics,
Probabilities

Factorial Factor 
200 
63 
NumberTheory,
Combinatorics

Revolution 
300 
22 
Combinatorics

Regular Polygons 
200 
53 
Geometry,
Combinatorics

Rooks 
600 
16 
Combinatorics

School Clubs 
500 
3 
Combinatorics

Infinite game 
500 
42 
Combinatorics,
Games

Pentagon 
500 
17 
Geometry,
Combinatorics,
Pentagons

Flights 
500 
9 
Combinatorics,
Graphs

Checkboard 
600 
3 
Combinatorics

MathForces Store 
500 
32 
Combinatorics

Prime Sets 
500 
8 
Combinatorics,
NumberTheory

Lin's Game 
400 
9 
Combinatorics,
Games

Half of Octahedron 
400 
123 
Combinatorics,
Graphs

Novirus 
300 
82 
Combinatorics,
Graphs

Half Integers 
500 
2 
Combinatorics,
Geometry

Parking 
300 
190 
Combinatorics

Weird games 
500 
20 
Combinatorics

Ordered papers 
300 
34 
Combinatorics

Friends Playing 
600 
18 
Combinatorics

Magic Ruler 
500 
7 
Geometry,
Combinatorics
