Explanation 12x12 magic square
The 12x12 magic square is an odd multiple of 4. To construct a 12x12 magic square there are less construction methods available than you can use to construct an 8x8 or 16x16 magic square. It is not possible to construct a Franklin magic 12x12 square, but you can construct an ultra magic or most perfect magic 12x12 square.
The methods to construct a 12x12 magic square are:
The Medjig 20x20 is a simple magic square.
The composite, concentric and trimagic 12x12 magic squares are 'specials'.
Use symmetric transformation and basic key method (ultra magic) to construct ultra magic 12x12 squares.
With the remaing methods you can construct most perfect magic 12x12 squares.