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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