Filters
One Piece Puzzle - Harry Nelson

Unknown / Metal

Designer: Harry Nelson
Maker: Doug Engel

Treasure Quest - Harry Nelson

Sequential Movement / Plastic

Designer: Harry Nelson
Maker: ThinkFun

Cool Circuits - Harry Nelson

Assembly / Plastic

Designer: Harry Nelson
Maker: Science Wiz

Cool Circuits Jr - Harry Nelson

Assembly / Plastic

Designer: Harry Nelson
Maker: Science Wiz

Stuff the Turkey - Harry Nelson

3D Packing / Wood

Designer: Harry Nelson
Maker: Harry Eng

Evergreen Tree Puzzle - Harry Nelson

Put-together / Wood

Designer: Harry Nelson
Maker: Walter Hoppe

Gravity Well - Harry Nelson

Assembly / Metal

Designer: Harry Nelson
Maker: Bits and Pieces