Kosuke Matsunaga (born in Kanagawa, Japan, in Nov. 1978) is an Assistant Professor at Sapporo City University, Japan. He received master of design degree from University of Kyushu Institute of Design, Japan, in 2004. In 2015, he received PhD from Kyushu University. He researches on human deformation modeling using programming based on mathematics or physics. And he create original geometric puzzle games.