Part of the Goukaku Boy educational series, this Game Boy title concentrates on geometry and spatial reasoning. 'Zukei no Tatsujin' translates to 'Master of Shapes,' hinting at the focus on understanding and manipulating geometric forms.  Gameplay may include puzzles requiring players to identify shapes, solve spatial reasoning problems, or perhaps even create and manipulate geometric patterns.  It maintains the series' focus on making education engaging through interactive elements.  The publisher's details are unknown.

Goukaku Boy Series - Shikakui Atama o Marukusuru - Zukei no Tatsujin (Japan)

Goukaku Boy Series - Shikakui Atama o Marukusuru - Shakai Battle Hen (Japan)