easy 00
easy 01
easy 02
easy 03
easy 04
easy 05
easy 06
easy 07
easy 08
easy 09
easy 0A
easy 0B
easy 0C
easy 0D
easy 0E
easy 0F
easy 10
easy 11
intermediate 12
intermediate 13
intermediate 14
intermediate 15
intermediate 16
intermediate 17
intermediate 18
intermediate 19
intermediate 1A
intermediate 1B
intermediate 1C
intermediate 1D
intermediate 1E
intermediate 1F
intermediate 20
intermediate 21
intermediate 22
intermediate 23
intermediate 24
intermediate 25
intermediate 26
intermediate 27
intermediate 28
intermediate 29
intermediate 2A
intermediate 2B
intermediate 2C
intermediate 2D
intermediate 2E
intermediate 2F
intermediate 30
intermediate 31
intermediate 32
intermediate 33
intermediate 34
intermediate 35
intermediate 36
medium 37
medium 38
medium 39
medium 3A
medium 3B
medium 3C
medium 3D
medium 3E
medium 3F
medium 40
medium 41
medium 42
medium 43
medium 44
medium 45
medium 46
medium 47
medium 48
medium 49
medium 4A
medium 4B
medium 4C
medium 4D
medium 4E
medium 4F
medium 50
medium 51
medium 52
medium 53
medium 54
medium 55
medium 56
medium 57
medium 58
medium 59
medium 5A
medium 5B
medium 5C
medium 5D
medium 5E
medium 5F
medium 60
medium 61
medium 62
medium 63
medium 64
medium 65
medium 66
medium 67
medium 68
medium 69
medium 6A
medium 6B
medium 6C
medium 6D
medium 6E
medium 6F
medium 70
medium 71
medium 72
medium 73
medium 74
medium 75
medium 76
medium 77
medium 78
medium 79
medium 7A
medium 7B
medium 7C
medium 7D
medium 7E
medium 7F
medium 80
medium 81
medium 82
medium 83
medium 84
medium 85
medium 86
medium 87
medium 88
medium 89
medium 8A
medium 8B
medium 8C
medium 8D
medium 8E
medium 8F
medium 90
medium 91
medium 92
medium 93
medium 94
medium 95
hard 96
hard 97
hard 98
hard 99
hard 9A
hard 9B
hard 9C
hard 9D
hard 9E
hard 9F
hard A0
hard A1
hard A2
hard A3
hard A4
hard A5
hard A6
hard A7
hard A8
hard A9
hard AA
hard AB
hard AC
hard AD
hard AE
hard AF
hard B0
hard B1
hard B2
hard B3
hard B4
hard B5
hard B6
hard B7
hard B8
hard B9
hard BA
hard BB
hard BC
hard BD
hard BE
hard BF
hard C0
hard C1
hard C2
challenging C3
challenging C4