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Japanese manufacturer Hanayama has been producing cast mechanical puzzles called "Cast", then "Huzzle" since 1983.
"Huzzle" is a combination of two words:
はずす (hazusu - to detach) + パズル (pazuru - puzzle) = はずる (hazuru - huzzle)
Huzzle difficulty varies from 1 (easy) to 6 (difficult). Depending on the reedition, the difficulty score can sometimes vary. This is the last difficulty level that indicated. Also sometimes name can change. In that case, both designation are given. Also small series were produced, sometimes in association with other brands.

Symbols meaning:
Marine serie (6 huzzles of 1,2,3 level)
Discontinued huzzles


Level 1

ABC
Nobuyuki Yoshigahara
1983

Key
Nobuyuki Yoshigahara
1983

Bike
John R. Lynn
1994
first patent in 1898

Flag
Nobuyuki Yoshigahara
1994

Seabream / Trout / Tai
Akio Yamamoto
1999

Shark / Fin
Akio Yamamoto
1999

Loop
Vesa Timonen
2007

Diamond
Scott Elliott
2016

Love
Scott Elliott
2020


Level 2

Horse
Nobuyuki Yoshigahara
1984

Claw / Crab
Akio Yamamoto
1998

Starfish / Penta
Akio Yamamoto
1999

Disk
Oskar van Deventer
2001

Keyring
Oskar van Deventer
2001

Cricket
James Dalgety from his collection 2002
Plate
Jerry Slocum
2005

Key II
Tomoya Otake
Kyoo Wong
2006

Hook
Vesa Timonen
2009

Medal
James Dalgety
2009
Box
Akira Yuta
2012

Harmony
Dmitry Revnitskiy
Kirill Grebnev
2012
Dot
Akio Yamamoto
2017

Snow
Kyoo Wong
2020

A&A
Vesa Timonen
2023


Level 3

Star
Nobuyuki Yoshigahara
1983

S&S
Nobuyuki Yoshigahara
1984

W-U
Nobuyuki Yoshigahara
1995

Cage
Nobuyuki Yoshigahara
1997

Reef / Coral
Akio Yamamoto
1999 or 2000

Seahorse / Tails
Akio Yamamoto
1999 or 2000

Dolce
Akio Yamamoto
2001

O'Gear
Oskar van Deventer
2002

Violon
Joseph L. Little
2003
first patent in 1965

Delta
Kyoo Wong
2013

G&G
Jin-Hoo Ahn
2013

Galaxy
Bram Cohen
2014

Hashtag / Shift
Yoshiyuki Kotani
Kirill Grebnev
2017

Arrows
Andrei Ivanov
2018

Slider
Vesa Timonen
2019

Dice
Timothy Collins
2021

Cross
Edi Nagata
2022

Hex
Masui Ohno
2023

Jam
Yuu Asaka
2025


Level 4

Ring
Nobuyuki Yoshigahara
2000
Heart
N/A
2001

Baroq
Akio Yamamoto
2003

L'œuf
Oskar van Deventer
2004

Cuby
Oskar van Deventer
2005

Coaster
Serhiy Grabarchuk
2006

Coil
Edi Nagata
2011

Donuts
Vesa Timonen
2011

Cylinder
Vesa Timonen
2013

Twist
Oskar van Deventer
2013

Keyhole
Vesa Timonen
2014

U&U
Kyoo Wong
2014

Hexagon
Mine Uyematsu
2015

Möbius
Oskar van Deventer
2015

Cake
Bram Cohen
2016

Dial
Vesa Timonen
2016

UFO
Vesa Timonen
2019

Valve
Vesa Timonen
2021

Planet
Masumi Ohno
2022


Level 5

Elk
Nobuyuki Yoshigahara
1986

Amour
Akio Yamamoto
1991

Devil
Nobuyuki Yoshigahara
1994

Laby
Nobuyuki Yoshigahara
1997

Spiral
Kennet Walker
2003

Ring II
Jose Grant
2004

Duet
Oskar van Deventer
2005

Radix
Akio Yamamoto
2005

Equa
Oskar van Deventer
2008

Helix
N/A
2009
created in 1990

Marble
Bram Cohen
Oskar van Deventer
2009

H&H
Oskar van Deventer
2010

Rattle
Bram Cohen
2010

Square
Vesa Timonen
2010

Padlock
Jin-Hoo Ahn
2016

Cyclone
Kyoo Wong
2020

Tube
Vesa Timonen
2022

Ripple
Kyoo Wong
2024


Level 6

Chain
Oskar van Deventer
2002

News
Nobuyuki Yoshigahara
2003

Enigma
Eldon Vaughn
2004
first patent in 1975

Nutcase
Oskar van Deventer
2007

Quartet
Mine Uyematsu
2007

Vortex
Akio Yamamoto
2008

Infinity
Vesa Timonen
2016

Trinity
Kyoo Wong
2017

Hourglass
Jin-Hoo Ahn
2018
Rotor
Kyoo Wong
2019

Key III
Oskar van Deventer
2024


Chess pieces serie in chrome color, also exist in black. 100 gold sets were sold at IPP35 Canada

Pawn
level 1 Marcel Gillen
Rook
level 1 Marcel Gillen
Knight
level 2 Marcel Gillen
Bishop
level 2 Marcel Gillen
Queen
level 3 Marcel Gillen
King
level 3 Marcel Gillen

Thematic reimplementation series ( Ultraman, The Legend of Zelda, Disney (colors vary according to the reedition)) and other

SSSP emblem shooting star
level 1 based on Diamond
Beta capsule
level 3 based on Cage
Ultra eye
level 4 based on News
Ultra guard emblem
level 4 based on Cylinder
Marble
level 5 based on Marble
limited to 500 items

Hyrule crest
level 4 based on Heart
Triforce
level 5 based on Delta
Master sword
level 6 based on Valve
Mickey Mouse ring
level 1 based on Loop
Mickey & Minnie key
level 2 based on key
Winnie the Pooh escape
level 2 based on Horse
Alice in Wonderland labyrinth
level 4 based on Laby
Nut
1987 a 3R type nut and bolt puzzle, other manufacturer made it since then
Lucky Puzzle
a seven metal pieces tangram
Oskar
Oskar van Deventer 1987, one element made of plastic
Medallion
Oskar van Deventer level 5 variation of L'œuf, first created for IMO2011 Amsterdam
Chris Ramsay X Hanayama
2019 level 2, a mix of ABC and Laby

Craighill (not a Hanayama puzzles, Kickstarter backed originally)

Jack
Venn
2018
Tycho
2020
Tetra
2021
Wavelinks
2023
Jack in the Box
2024