Use 3x3 the 4x4 magic square and the '4x4 blown up' 3x3 magic square to produce a (simple) 12x12 magic square.
Take a number from the first grid and add (number -/- 1) x 16 of the same cell from the second grid.
1x number
1 | 8 | 13 | 12 | 1 | 8 | 13 | 12 | 1 | 8 | 13 | 12 |
15 | 10 | 3 | 6 | 15 | 10 | 3 | 6 | 15 | 10 | 3 | 6 |
4 | 5 | 16 | 9 | 4 | 5 | 16 | 9 | 4 | 5 | 16 | 9 |
14 | 11 | 2 | 7 | 14 | 11 | 2 | 7 | 14 | 11 | 2 | 7 |
1 | 8 | 13 | 12 | 1 | 8 | 13 | 12 | 1 | 8 | 13 | 12 |
15 | 10 | 3 | 6 | 15 | 10 | 3 | 6 | 15 | 10 | 3 | 6 |
4 | 5 | 16 | 9 | 4 | 5 | 16 | 9 | 4 | 5 | 16 | 9 |
14 | 11 | 2 | 7 | 14 | 11 | 2 | 7 | 14 | 11 | 2 | 7 |
1 | 8 | 13 | 12 | 1 | 8 | 13 | 12 | 1 | 8 | 13 | 12 |
15 | 10 | 3 | 6 | 15 | 10 | 3 | 6 | 15 | 10 | 3 | 6 |
4 | 5 | 16 | 9 | 4 | 5 | 16 | 9 | 4 | 5 | 16 | 9 |
14 | 11 | 2 | 7 | 14 | 11 | 2 | 7 | 14 | 11 | 2 | 7 |
+ (number -/- 1) x 16
2 | 2 | 2 | 2 | 9 | 9 | 9 | 9 | 4 | 4 | 4 | 4 |
2 | 2 | 2 | 2 | 9 | 9 | 9 | 9 | 4 | 4 | 4 | 4 |
2 | 2 | 2 | 2 | 9 | 9 | 9 | 9 | 4 | 4 | 4 | 4 |
2 | 2 | 2 | 2 | 9 | 9 | 9 | 9 | 4 | 4 | 4 | 4 |
7 | 7 | 7 | 7 | 5 | 5 | 5 | 5 | 3 | 3 | 3 | 3 |
7 | 7 | 7 | 7 | 5 | 5 | 5 | 5 | 3 | 3 | 3 | 3 |
7 | 7 | 7 | 7 | 5 | 5 | 5 | 5 | 3 | 3 | 3 | 3 |
7 | 7 | 7 | 7 | 5 | 5 | 5 | 5 | 3 | 3 | 3 | 3 |
6 | 6 | 6 | 6 | 1 | 1 | 1 | 1 | 8 | 8 | 8 | 8 |
6 | 6 | 6 | 6 | 1 | 1 | 1 | 1 | 8 | 8 | 8 | 8 |
6 | 6 | 6 | 6 | 1 | 1 | 1 | 1 | 8 | 8 | 8 | 8 |
6 | 6 | 6 | 6 | 1 | 1 | 1 | 1 | 8 | 8 | 8 | 8 |
= (simple) 12x12 magic square
17 | 24 | 29 | 28 | 129 | 136 | 141 | 140 | 49 | 56 | 61 | 60 |
31 | 26 | 19 | 22 | 143 | 138 | 131 | 134 | 63 | 58 | 51 | 54 |
20 | 21 | 32 | 25 | 132 | 133 | 144 | 137 | 52 | 53 | 64 | 57 |
30 | 27 | 18 | 23 | 142 | 139 | 130 | 135 | 62 | 59 | 50 | 55 |
97 | 104 | 109 | 108 | 65 | 72 | 77 | 76 | 33 | 40 | 45 | 44 |
111 | 106 | 99 | 102 | 79 | 74 | 67 | 70 | 47 | 42 | 35 | 38 |
100 | 101 | 112 | 105 | 68 | 69 | 80 | 73 | 36 | 37 | 48 | 41 |
110 | 107 | 98 | 103 | 78 | 75 | 66 | 71 | 46 | 43 | 34 | 39 |
81 | 88 | 93 | 92 | 1 | 8 | 13 | 12 | 113 | 120 | 125 | 124 |
95 | 90 | 83 | 86 | 15 | 10 | 3 | 6 | 127 | 122 | 115 | 118 |
84 | 85 | 96 | 89 | 4 | 5 | 16 | 9 | 116 | 117 | 128 | 121 |
94 | 91 | 82 | 87 | 14 | 11 | 2 | 7 | 126 | 123 | 114 | 119 |
I have used method composite, simple to construct
9x9, 12x12, 15x15a, 15x15b, 18x18, 20x20, 21x21a, 21x21b, 24x24a, 24x24b, 25x25, 27x27a, 27x27b, 28x28, 30x30a, 30x30b