What's inside the box? Walkthrough

What's inside the box? by Bart Bonte answers, cheats, solutions for all 100 levels. What's inside the box? is a neat puzzle game, it consists of 100 levels, each level containing a box with a logical puzzle that needs solving.
The puzzles increase in difficulty, and on some of them you will need to consult a walkthrough to successfully pass them. Below you can find the solutions, with pictures, for all 100 levels in What's inside the box?

Level 1
Level 2
Level 3
Level 4
Level 5
Level 6
Level 7
Level 8
Level 9
Level 10
Level 11
Level 12
Level 13
Level 14
Level 15
Level 16
Level 17
Level 18
Level 19
Level 20
Level 21
Level 22
Level 23
Level 24
Level 25

Level 26
Level 27
Level 28
Level 29
Level 30
Level 31
Level 32
Level 33
Level 34
Level 35
Level 36
Level 37
Level 38
Level 39
Level 40
Level 41
Level 42
Level 43
Level 44
Level 45
Level 46
Level 47
Level 48
Level 49
Level 50

Level 51
Level 52
Level 53
Level 54
Level 55
Level 56
Level 57
Level 58
Level 59
Level 60
Level 61
Level 62
Level 63
Level 64
Level 65
Level 66
Level 67
Level 68
Level 69
Level 70
Level 71
Level 72
Level 73
Level 74
Level 75

Level 76
Level 77
Level 78
Level 79
Level 80
Level 81
Level 82
Level 83
Level 84
Level 85
Level 86
Level 87
Level 88
Level 89
Level 90
Level 91
Level 92
Level 93
Level 94
Level 95
Level 96
Level 97
Level 98
Level 99
Level 100