Polyomino magic square

 

It is difficult to explain 'what is a Polyomino magic square'. A 3x3 Polyomino magic square is firstly an impure 3x3 magic square and secondly a (27x27) cell magic square. See below 3 examples of a 3x3 Polyomino magic square.

 

 

See below an example of a 4x4 Polyomino magic square.

 

 

Source is Yoshiaki Araki. See website www.tessellation.jp