TDK Core was a game maker that once existed.

Established in 1979.
It is now a company mainly focused on manufacturing electrical equipment in Japan, with game software production being in its early days.

Around the same time, they focused on developing recording media such as videotapes, analog audio tapes, and floppy disks, expanding in scale, and have grown into a major manufacturer that now produces and sells electronic materials, electronic components, magnetic heads, secondary batteries, etc.