Yoshiyuki Kotani

12 Snakes Puzzle
12 Snakes Type II
Cast Hashtag
Chariot
Connection
Constellation
Desert Rose
Gemini A
Gemini B
Icy Planet
Nose and Lips
RS-Octagon
Too Many Paddles
Turtle's Heart
Two Piece Boxed Burr 2PBB
Yy Double Decker