Welcome to my guide!
First of all, i'll explain the achievements.
6 are for standard level completion.
The rest below, with detailed description.

Scoreman
Improve the score of a level
[Replay any level and complete it faster]

Never Give Up
Win a level after 10 losses
[Lose at least 10 times during a single level, then complete it]

No fear of the dark
Beat a dark level
[It will be easy to notice a dark level because of the timer in the middle of the screen before you can start.
Complete one of the following levels while dark move is active
17, 19, 21, 23, 25, 27, 28, 31, 33, 34, 36, 40, 41, 44, 46, 48, 50
If you fail a lot, dark mode can be disabled for that specific level, and changed to easy mode]

10.000 Points
Reach 10.000 Points
[This should come naturally as you complete all the levels]

TOP 1
Reach the first place in the ranking
[Being removed soon?]
~~~~~
In the sections below, there will be video, and the sums listed alongside.
The sum is where you move to, and the answer is where you click.
For example.
1 + 2 = 3 [Move to 1, then 2 and click 3]

1.
1 + 1 = 2

2.
4 - 3 = 7

3.
2 + 3 = 5
5 - 3 = 2

4.
2 + 5 = 7
6 + 4 = 10

5.
6 - 3 = 3
9 - 5 = 4

6.
11 - 6 = 5
9 - 6 = 3
13 - 4 = 9

7.
6 + 1 = 7
1 + 9 = 10
4 + 9 = 13

8.
5 - 2 = 3
4 + 10 = 14
10 - 4 = 6

9.
14 - 1 = 13
12 - 6 = 6
13 - 2 = 11

10.
5 + 5 = 10
8 + 5 = 13
9 + 6 = 15

11.
5 + 7 = 12
9 + 4 = 13
5 + 5 = 10

12.
8 + 1 = 9
6 + 2 = 8
5 + 6 = 11

13.
2 + 2 = 4
5 - 2 = 3
4 - 2 = 2

14.
6 + 7 = 13
8 + 2 = 10
2 + 2 = 4

15.
13 - 6 = 7
11 - 6 = 5
7 - 4 = 3

16.
6 - 1 = 5
13 - 1 = 12
3 - 1 = 2

17.
2 + 7 = 9
10 - 7 = 3
4 - 2 = 2

18.
10 - 6 = 4
5 + 5 = 10
6 - 4 = 2

19.
2 + 9 = 11
2 + 2 = 4
5 - 2 = 3

20.
11 - 1 = 10
1 - 0 = 1
6 - 0 = 6

21.
2 + 10 = 12
5 + 1 = 6
3 - 2 = 1

22.
7 + 8 = 15
5 + 2 = 7
8 + 5 = 13

23.
12 - 3 = 9
10 - 3 = 7
7 - 3 = 4

24.
10 + 2 = 12
4 + 5 = 9
8 - 2 = 6

25.
8 + 3 = 11
3 + 10 = 13
10 - 4 = 6

26.
4 + 8 = 12
1 + 1 = 2
5 + 1 = 6
9 - 4 = 5

27.
8 + 5 = 13
7 + 2 = 9
5 + 2 = 7

28.
5 + 4 = 9
5 + 6 = 11
9 - 6 = 3

29.
6 + 4 = 10
3 + 6 = 9
4 + 4 = 8

30.
6 + 4 = 10
3 + 5 = 8
6 - 5 = 1

31.
12 - 11 = 1
13 - 4 = 9
7 - 4 = 3

32.
12 - 5 = 7
13 - 10 = 3
7 - 2 = 5
6 + 0 = 6

33.
6 + 7 = 13
1 + 5 = 6
8 - 5 = 3
8 + 7 = 15

34.
4 + 9 = 13
1 + 8 = 9
5 + 6 = 11
10 + 5 = 15

35.
11 - 3 = 8
14 - 5 = 9
3 - 1 = 2
14 - 1 = 13

36.
8 + 4 = 12
2 + 5 = 7
12 - 4 = 8
4 + 2 = 6

37.
4 + 0 = 4
13 - 10 = 3
12 - 10 = 2
14 - 5 = 9

38.
12 - 5 = 7
11 - 6 = 5
11 - 2 = 9
7 - 6 = 1

39.
9 + 4 = 13
5 - 3 = 2
7 + 3 = 10
5 + 1 = 6

40.
2 + 8 = 10
1 + 2 = 3
9 + 4 = 13
5 + 9 = 14

41.
13 - 13 = 0
7 - 3 = 4
12 - 1 = 11
3 - 0 = 3

42.
12 - 2 = 10
8 - 5 = 3
14 - 13 = 1
14 - 7 = 7

43.
13 - 2 =11
6 - 2 = 4
14 - 2 = 12
5 - 2 = 3

44.
4 + 8 = 12
8 + 1 =9
4 + 4 = 8
6 + 5 = 11

45.
9 + 4 = 13
14 - 8 = 6
4 - 2 = 2
13 - 5 = 8

46.
3 + 3 = 6
3 + 8 = 11
2 + 1 = 3
7 + 5 = 12

47.
7 - 6 = 1
13 - 9 = 4
12 - 6 = 6
14-2 = 12
14 - 0 = 14

48.
9 - 8 = 1
4 + 2 = 6
10 + 2 = 12
9 + 4 = 13
9 + 5 = 14

49.
12 - 5 = 7
13 - 3 = 10
8 - 3 = 5
13 - 4 = 9
6 - 2 = 4

50.
8 + 6 = 14
4 + 4 = 8
5 + 1 = 6
10 + 1 = 11
2 - 1 = 1