Filters
Dragon Cube - Doug Engel

Interlocking

Designer: Doug Engel
Maker: PuzzleAtomic

Magic Puzzle - Doug Engel

Sequential Movement / Plastic

Designer: Doug Engel
Maker: Tsukuda Original

Loyds's Blocks - Doug Engel

Sliding

Designer: Doug Engel
Maker: Doug Engel

EZ Atom - Doug Engel

Disassembly / Metal

Designer: Doug Engel
Maker: Bits and Pieces

Turnstile - Doug Engel

Sequential Movement / Plastic

Designer: Doug Engel
Maker: Binary Arts

Loyd's 15 - Doug Engel

Sequential Movement / Plastic

Designer: Doug Engel
Maker: Brainwright

Yin and Yang (Wooden) - Doug Engel

Interlocking / Wood

Designer: Doug Engel
Maker: multiple manufacturers

Yin and Yang - Doug Engel

Interlocking / Metal

Designer: Doug Engel
Maker: Bits and Pieces

Electrihedron Puzzle - Doug Engel

Interlocking

Designer: Doug Engel
Maker: General Symmetrics, Inc (Doug Engel)

Rhombi Box Puzzle - Doug Engel

Put-together / Wood

Designer: Doug Engel
Maker: General Symmetrics, Inc (Doug Engel)

Tube Box Puzzle  - Doug Engel

Put-together / Wood

Designer: Doug Engel
Maker: General Symmetrics, Inc (Doug Engel)

Cuboctobox - Doug Engel

Put-together / Wood

Designer: Doug Engel
Maker: General Symmetrics, Inc (Doug Engel)

Rocti Box Puzzle - Doug Engel

Put-together / Wood

Designer: Doug Engel
Maker: General Symmetrics, Inc (Doug Engel)

Tetra Star Box - Doug Engel

Put-together / Wood

Designer: Doug Engel
Maker: General Symmetrics, Inc (Doug Engel)

Hidden Scroll - Doug Engel

Disassembly / Metal

Designer: Doug Engel
Maker: Bits and Pieces

EZ Galaxy - Doug Engel

Take-apart

Designer: Doug Engel
Maker: Puzzle Master

EZ Un Link - Doug Engel

Take-apart / Metal

Designer: Doug Engel
Maker: Puzzle Master

EZ-1 - Doug Engel

Take-apart / Metal

Designer: Doug Engel
Maker: Puzzle Master

Butterfly - Doug Engel

Take-apart / Metal

Designer: Doug Engel
Maker: Bits and Pieces

Saturn - Doug Engel

Take-apart

Designer: Doug Engel
Maker: Doug Engel