Best Mechanical Puzzles Ever: Greg's List
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Best Mechanical Puzzles
This is my personal list of favorite mechanical puzzles - separated by type, opinionated, and filtered entirely through my own experience. I've been solving mechanical puzzles for over 20 years now, running Greg Puzzles and spending way too much time thinking about what separates a great puzzle from a forgettable one. This list is based on my experience, solving philosophy and personal preference. I am not the almighty decider of what makes a puzzle good, but just a dude who loves puzzles, so my opinion is biased. There are thousands of mechanical puzzles out there. Many I've solved, many I've studied in depth, many I know only by reputation. What follows is what I know and can rank - filtered through my own philosophy of what makes a puzzle worth caring about. I've organized everything into categories because the mechanical puzzle world is massive and lumping a sequential discovery puzzle next to a packing puzzle helps nobody. Whether you're new to the hobby, deep in it, or buying for a puzzle lover - I hope this becomes a useful reference point.
What Makes a Great Mechanical Puzzle
Puzzles have always been a part of my life. Even as a kid, I'd get the occasional Hanayama or Rubik's Cube as a gift from my parents or their friends. I got seriously into puzzles around age 12 or 13 via Revomaze, and it's only grown from there. Decades of solving, collecting, creating hundreds of puzzle videos, running Greg Puzzles - all of that shapes how I look at a puzzle today.
My taste has shifted a lot over the years. When I first got serious about puzzles, I was very time-focused - how fast could I solve it, how hard was it, how many moves did it take. That framing isn't wrong exactly, but it misses the point for me now. I care way more about mechanism elegance than raw difficulty. A puzzle that takes me three hours because it's genuinely clever is infinitely more satisfying than one that takes three hours because it's just tedious.
Two things I really love: a low piece count, and puzzles that look simple at first glance but prove to be genuinely challenging. When a designer can build a real problem out of two, three, or four pieces - or when someone picks up the puzzle, thinks "this looks easy," and then hits a wall - that's the stuff I care about. Minimal presentation, maximum depth. That combination is rare and I gravitate toward it every time.
The "aha moment" is everything to me. That click - physical or mental - where the puzzle reveals its logic and suddenly the solution feels obvious in hindsight. That's what I'm chasing. A puzzle where the goal is completely opaque and the path is just random fumbling doesn't do it for me anymore. The goal should be findable. The path should still surprise you.
I also think a lot about what I call "giveability." I want puzzles I can hand to friends who've never solved a mechanical puzzle before and have them actually enjoy the experience - not stare at it, get frustrated, and put it down. That's a high bar. It means the difficulty curve is right, the mechanism is satisfying to fiddle with even before you finish, and there's a real chance the person walks away happy. A puzzle that lives permanently on my shelf because nobody can touch it without giving up - that's a less interesting object to me.
The best puzzles sit at the edge of your ability, not past it. They're hard enough to feel like an accomplishment, accessible enough that you don't need a walkthrough to even know what you're trying to do. That balance is rare, and when a designer nails it, it shows.
To keep this list digestible, I will write a short sentence on each puzzle. Always feel free to reach out for recommendations via email.
2D Packing Puzzles
2D packing puzzles give you a flat tray or frame and a set of pieces that need to fit inside with no gaps and no overlaps. Constraints vary - sometimes the frame is oddly shaped, sometimes the pieces are near-identical, sometimes the goal is a specific pattern rather than just "fill the space." Some of the tightest, most elegant designs in mechanical puzzling live in this category.
Four Fit (Stewart Coffin)
MUCH Harder than I thought, but very easy to pick up. Couldn't solve it for years.
Alpacka 1 (Alexander Magyarics)
Beautiful merge of a packer and a maze. Loved it
Alpacka 2 (Alexander Magyarics)
The sequel to Alpacka 1.
Trimini Frame (Lucie Pawels)
Interesting twist on a packing puzzle.
Galette (Osanori Yamamoto)
One of Osanori's top puzzles. It's very simple looking and sleek in design.
Wing (Acazu)
The first Acazu puzzle I tried. Not hard, but very nice.
Red Circle (Vladimir Krasnoukhov)
Beautifully deceptive.
Ice 9 (Yuu Asaka)
It took me much longer than I will admit. One of Yuu Asaka's best puzzles.
Creep 2 (Yuu Asaka)
I love puzzles with small amounts of pieces. This one is not too hard, but has a beautiful solve experience.
Jigsaw 29 (Yuu Asaka)
This puzzle inspired many designers and was a huge hit for non-puzzlers as well.
Only 4 (Nur 4) (Jean-Claude Constantin)
Lots of replayability. I believe it is based on the Four Fit from Stewart Coffin.
Sliders / 7 Solutions (Alexander Magyarics)
I love puzzles with more than one challenge, especially when it doesn't require lots of setup. Each challenge is fun.
Goddess of Lightning (Alexander Magyarics)
It's tough. I like the shapes.
Sun Symmetry (Frederic Boucher)
Interesting twist on a symmetry puzzle.
Available at NothingYet Designs
Lil Pack (Frederic Boucher)
I solved this for a video a few years ago. Really loved the amalgamation of different puzzle types.
Available at NothingYet Designs
Quatro Fromaggi (Jean-Claude Constantin)
Got this in IPP43 Exchange in Italy from Will Strijbos. I loved the unusual mechanism of the puzzle. Note that there's more than one puzzle with this name. I am not sure it is available for purchase, unfortunately.
3D Packing Puzzles
A 3D packing puzzle gives you a set of pieces and a container - usually a cube or box - and your job is to fit every piece inside with no room to spare. Sounds simple. It's not. The best ones have a single solution and finding it feels like cracking a code.
6N Puzzle (Osanori Yamamoto)
Solved this in IPP42 in Tokyo, where I also met Osanori Yamamoto for the first time. I loved the solution, and most of all - loved that there are 6 identical pieces with such a nice level of challenge.
Xmas Stocking (Osanori Yamamoto)
The pieces are similar to 6N, but there's 5 of them and the box is different. The appeal is similar for me. Much easier than 6N!
MINIMA Tower (Frederic Boucher)
Frederic's favorite MINIMA puzzle. I love the fact it's seemingly very simple, and uses only 4 identical L pieces.
MINIMA Slider (Frederic Boucher)
My exchange puzzle for IPP43. Got high praise from Boaz Feldman, Stephan Baumegger, Andreas Rover and many more solvers and buyers!
4L Puzzle (Yasuhiro Hashimoto)
Considered to be one of the best packing puzzles.
BonBon (Frederic Boucher)
Seemingly simple. I loved the sequence, and even though I have lots of experience with these, I was challenged.
Tenchi (Frederic Boucher)
One of Frederic's most brilliant ideas.
Chain Store (Goh Pit Khiam)
Love the use of one object that needs to be fit in a simple box.
Shrinking Soma (Dr. Volker Latussek)
Dr. Volker's brilliant anti-slide twist on the Soma pieces.
Cubiz (Frederic Boucher)
Customer requested Boucher puzzle!
Waltz (Osanori Yamamoto)
Absolutely brilliant. Yamamoto-san took 2 pieces and a box to a new level of piece dance.
A6L
Satisfying with simple-looking pieces. Not easy.
Loach Bed (Osanori Yamamoto)
In my opinion, this is the most brilliant Osanori to date.
MINIMA XIII (Frederic Boucher)
My favorite version of the classic MINIMA series.
Available at NothingYet Designs
Interlocking Puzzles
Interlocking puzzles are made of pieces that hold each other together through their geometry - you have to disassemble them in a specific sequence and reassemble them the same way. The genre includes burrs and coordinate motion puzzles as sub-styles.
Daedalus (Gregory Benedetti)
Absolute monster of a puzzle. This cube interlocks and solves like crazy.
Solving it for the second time took me more time than the first.
Burr Puzzles
Burrs are interlocking puzzles typically made of notched sticks that fit together into a symmetric shape. Modern designs push the piece counts and move-sequences to extremes.
6-Piece Burr (classic)
A.k.a 6-Piece Cross. The first burr puzzle I did. It was very hard back then - I was maybe 13 or 14 years old.
3-Piece Cross
Good interlocking puzzle to start with.
Coordinate Motion
Coordinate motion puzzles require multiple pieces to move simultaneously to assemble or disassemble - no single piece moves alone. Beautiful to watch, satisfying to solve.
Heart in a Heart
Beautiful metal puzzle by Will Strijbos.
Vinco Puzzles
Vinco has many beautiful coordinate motion puzzles at a comfortable price. I recommend checking them out.
Turning Interlocking Cubes (TICs)
The TIC series by Andrew Crowell is a modern family of interlocking cube puzzles where the pieces have to rotate as they interlock - not just slide, but turn. The result is a puzzle style you can't really replicate with traditional woodworking, and Andrew has built a whole universe of variants within it. Below are the ones I consider standouts. See the full TIC collection for all 30+ available at Greg Puzzles.
The GOATs
GeneTIC (Andrew Crowell)
One of the first TICs I tried. I was hooked.
FantasTIC (Andrew Crowell)
Second TIC I tried. Fueled my obsession.
EcstaTIC (Andrew Crowell)
The BEST TIC to give to someone who never solved a TIC, or a puzzle, before.
Also Featured:
TwisTIC (Andrew Crowell)
QuadraTIC (Andrew Crowell)
HypnoTIC (Andrew Crowell)
MysTIC (Andrew Crowell)
PoeTIC (Andrew Crowell)
NervousTIC (Andrew Crowell)
LocomoTIC (Andrew Crowell)
GalacTIC (Andrew Crowell)
BioTIC (Andrew Crowell)
Assembly Puzzles
Assembly puzzles are the classic "take these pieces and build a specific shape" category. Simpler than burrs and packing puzzles in construction, but the elegance is in how a low piece count can still produce a genuinely tough problem.
Three-Piece Block
It looks very simple. But it's kinda brain-smashing.
6-Piece Star
Super classic. Had lots of fun with it in my childhood
2-Piece Pyramid
Easy-looking puzzle. Great on desks.
Baby Puzzle
One of the best puzzles for newbies!
Cube Alchemy
Classic puzzle with handpicked challenges by us.
Snake Cube (classic)
Very common puzzle, deserving its popularity.
Secret-Mechanism Puzzle Boxes
Puzzle boxes with hidden mechanisms - you have to find and manipulate a secret opening to reveal what's inside (or just open the box). In this category you can find the Japanese Karakuri Creation Group and a handful of legendary independent designers.
Impossible Dovetail Box
The Viral Impossible Dovetail. Was a big hit in mid 2010s
Karakuri Egg (Karakuri Creation Group)
Funny idea from KCG. A good example of their puzzling philosophy.
Karakuri Super Cubi (Karakuri Creation Group)
Highly enjoyed this one.
Available at Karakuri Creation Group
Karakuri Small Box 6 (Karakuri Creation Group)
My first Karakuri puzzle. Easy but fun.
Available at Karakuri Creation Group
Mittan Puzzle Box (Juno)
Juno is one of the most prolific puzzle box designers of our times. This was a cute Cat Puzzle Box I had the pleasure of solving.
Sequential Discovery Puzzles
Sequential discovery puzzles is a favorite genre among many puzzle lovers. You're solving one step to reveal the next - each mechanism, tool, or piece you find leads to another. The best ones have layers of surprises and finish with a genuine revelation. This category includes a few different types of Sequential Discovery
Fire Truck (2222pzzls)
Jeroen Kruit is a new rising star in the world of puzzles. His vehicle puzzles are sometimes described as a "3D Printed Juno". Pretty big title if you ask me!
Coal Train (2222 Puzzles)
Another Jeron Kruit vehicle puzzle.
Down the Rabbit Hole
This book has many cool secrets.
The Brass Cannon
One of the best entry points into sequential discovery.
Turtle Trip (Gerard Hudson)
Cool SD puzzle with a mechanism that really surprised me. At the time, it was quite the revolutionary idea.
Was Available at Bayou Puzzles
Mighty Pin (Alan Lunsford)
Alan Lunsford has some great, compact SD puzzles. This is one of them.
Keebox One
Great quality 3D printed puzzle box. The mechanisms of Keebox are very polished and fun to figure out.
Houdini's Torture Cell (Brian Young)
Another fantastic entry point into sequential discovery puzzles.
Available at Puzzle Master (also at Crux Puzzles)
Angel Box (Will Strijbos)
Wil's masterpiece. I was looking for it for years. It's today extremely difficult to find, but definitely a puzzle to try at least once for hardcore solvers.
Pachinko (Wil Strijbos)
The puzzle I traded Big Ben for. One of my most prized possessions. Very Hard.
Big Ben (Brian Young)
One of the most beautiful Brian Young puzzles. It's not easy, but compared to his other SDs its quite solvable.
A Plugged Well (Brian Young)
Another unicorn by Brian. It's shorter in length but has some interesting ideas.
Lotus (Wil Strijbos)
One of the first SD puzzles I did. It deserves the hype.
First Box (Wil Strijbos)
Got this along Lotus. It's on the easier side, but beautiful piece.
Visitor Q (Frederic Boucher)
One of the first puzzles I saw from Frederic. I was blown away by this idea, and the value it holds as a puzzle.
Available at NothingYet Designs
MINIMA Smiley (Frederic Boucher)
Absolutely beautiful implementation of Visitor Q ideas into a MINIMA-sized box.
Available at NothingYet Designs
DANLOCK (Dan Feldman)
Legendary Sequential Discovery Lock Puzzle. I consider this a MUST-try SD puzzle.
Escape-Room-in-a-Box (Sub-Category)
iDventure builds the escape-room-in-a-box genre better than anyone. Each puzzle is a themed sequence of mechanical challenges you solve to open the final compartment. My favorites are below.
Cambridge Labyrinth (iDventure)
My favorite IDventure puzzle box. The difficulty is just right and the progression is beautiful.
Davy Jones' Locker (iDventure)
Another great IDventure puzzle. I like the design a lot.
Sherlock's Camera (iDventure)
Probably the hardest one of the series. Great for pros.
CLUEBOX: Trial of Camelot (iDventure)
Super nice theme. Long solution. Great one.
CLUEBOX: Schrödinger's Cat (iDventure)
The one that started the series.
Puzzle Locks
Trick locks - locks that require unusual moves, hidden mechanisms, or sequential solutions to open. Some overlap with sequential discovery, but these are ones where the lock itself is the star.
B.LOCK 2 (Boaz Feldman)
My favorite Puzzle Lock to show to friends.
Loophole
I found it relatively simple, but enjoyed the idea a lot.
Popplock T12 (Rainer Popp)
Popplocks are one of the most sought after puzzle locks among collectors. I had the opportunity to solve T12. It is pretty hard to get.
TrickLock 2015 / 2016 / 2017 / 2018 (Louis Coolen)
Louis is a great puzzle solver and a great guy too. I think he managed to create something very unusual with these. Unique mechanisms thanks to the fact that SLS was used to produced them.
Cast Metal Puzzles
Cast metal puzzles are dominated by the Hanayama Cast series - dozens of small metal puzzles across 50+ years of releases, ranging from beginner to brutal. The tier below reflects my own tier-list of the Hanayamas I've solved. I've also included a handful of premium metal designs from Craighill, Felix Ure, and independent makers.
Hanayama S-Tier - Must-Have
These are the ones I'd tell any newcomer to buy first. Every one earns its spot.
Cast Diamond (Hanayama)
BEAUTIFUL mechanism. Extremely pick-upable. Challenging enough to give to someone new.
Cast Slider (Hanayama)
Incredibly satisfying mechanism. Not too hard, but not trivial either.
Cast Medallion (Hanayama)
My personal favorite Hanayama. I resolved it more times than I can count.
Cast Enigma (Hanayama)
I used to not like it very much, but when I took a weekend (!) to understand it, I learned to appreciate it.
Cast Horse (Hanayama)
A trick-like Hanayama puzzle. Based on a classic puzzle.
Hanayama A-tier - Amazing Experience
Almost top tier. Every one of these is worth owning if you're building out a Hanayama collection.
Cast Dot (Hanayama)
Cool movement. Unusual object.
Cast Marble (Hanayama)
Incredibly satisfying. can be challenging for most solvers.
Cast Helix (Hanayama)
Brilliant.
Cast Love (Hanayama)
Very close to Diamond in terms of experience, but Diamond has identical shapes - which makes it superior in my terms.
Cast U&U (Hanayama)
Absolutely crazy Hanayama.
Cast Loop (Hanayama)
Similar to Diamond and Heart. This one is the easiest one in the series, and also a great puzzle to give to friends.
Cast Dial (Hanayama)
Quite challenging, hard-to-grasp mechanism.
Great-Looking Hanayama Collars
The puzzle side may be ok on these, but the design makes them stand out - great to display, great to gift.
Cast Master Sword (Hanayama x Legend of Zelda)
The most popular Hanayama collab. Would be challenging for most.
Cast Master Ball (Hanayama x Pokémon)
Pokemon Leaf-Green on the GBA is such a great childhood memory for me. I have solved the whole series. Master ball has a cool mechanism. The most interesting one for me was the Super Ball, but it's quite niche. Monster Ball is on the easier side. Hyper Ball was ok.
Premium Metal Puzzles
Wavelinks (Craighill)
My Favorite puzzle from craighill. Beautiful movements, beautiful product.
Jack Puzzle (Craighill)
Craighill's take on the 6-piece burr.
Felix Ure
Ure's designs push metal puzzle craftsmanship to a level nobody else touches. Precision-machined, expensive, and worth it.
Piston (Felix Ure)
Great Sequential Discovery puzzle by Felix. I thoroughly enjoyed solving it.
Titan (Felix Ure)
Considered by many to be one of world's hardest puzzles. Extremely frustrating. Most people will never solve it.
Disentanglement / Wire / Ring Puzzles
Wire puzzles ask you to separate two entangled pieces - usually a ring, a chain, or a shaped piece looped through another. The mechanism is topology, and once you see the "impossible" move, you feel dumb for not seeing it sooner.
Chinese Rings
Cool puzzle with possibly many moves and logical sequence.
Hedhehog in a Cage
Classic Czech puzzle.
Twisty Puzzles
Twisty puzzles are the Rubik's Cube family - rotating layers on a cube (or other polyhedron) to reach a target state. This is a category with its own competitive scene, algorithms, and speed-solving culture.
Rubik's Cube 3x3
The OG. Needs no introduction.
Rubik's Cube 2x2
Good for those who know how to solve 3x3.
Rubik's Cube 4x4
Introduces new concepts in addition to 3x3 rules.
Rubik's Cube 5x5
This takes the 4x4 to a new level, and also introduces some new things.
Megaminx
Super fun once you know the 3x3. Has some slight differences.
Skewb
This is where things get different. There are many more twisty puzzles that break the shape of a Rubik's Cube, with different ideas and solutions. As far as I remember, this one uses a different procedure. There are also other 3x3 based twisty puzzles, like mirror cube. In those ones, the goal is to identify the shapes and how to apply algorithms to them.
Square-1
Crazy. Different type of Twisty Puzzle. This has a weird part that blocks some moves.
Sequential Movement Puzzles
Sequential movement puzzles require you to move pieces in a specific order along fixed paths - sliding tile puzzles, disk stackers, path-constrained mazes. Efficient thinking beats brute force in this category.
Tower of Hanoi
A puzzle with various length, depending on the number of disks.
15 Puzzle
Classic puzzle. I used to have one when I was a kid, and it mildly blew my mind back then.
Klotski
Sliding puzzle with a long solution. I believe this was the inspiration for Rush Hour.
Rush Hour (Nob Yoshigahara)
Super classic puzzle by the legendary puzzle designer Nob from Japan.
Labynary (Jean-Claude Constantin)
INCREDIBLY Complicated JCC n-ary puzzle. My favorite puzzle in this category.
N52 (Jean-Claude Constantin)
An introductory puzzle into n-ary puzzles. There are various sizes and difficulties.
Maze Puzzles
Maze puzzles hide a path from start to end, sometimes visible, sometimes hidden inside a mechanism. The best modern mazes wrap the maze inside a solid object so you can't see where you're going.
Revomaze Bronze (Chris Pitt)
Revomaze is my OG puzzle series. In my opinion, Bronze is their best one. Only available second hand today.
Revomaze Orange (Chris Pitt)
Incredible Revomaze. This one is a little harder than Bronze. But also harder to find.
Inside3
Nice and minimalistic ball bearing maze.
Fast Maze (Dan Fast)
Great puzzle by Dan. Navigate many layers of a maze at the same time.
Split Maze Burr
One of the greatest Maze puzzles in existence. Many challenges, lots of fun. Pretty hard to find.
Rhombic Maze Burr
An expansion of the idea of Split Maze Burr in a different shape. Easier to obtain.
Available at Two Brass Monkeys
Dexterity Puzzles
Dexterity puzzles need a steady hand and physical precision as much as they need brain power. CoreMods has built the best modern dexterity puzzle collection - I'm featuring their two standout series below.
Unstable Eggs (CoreMods)
All three Unstable Eggs sets are worth owning. Each is a tactile dexterity challenge with a satisfying physical goal.
Dexterity Dimensions (CoreMods)
A larger series - showing the first three below as a sample of the style. All are worth exploring if you like the format.
Trick Puzzles
Trick puzzles have a hidden "gotcha" - a physical trick that makes the solution feel impossible until you spot the trick. These are pure novelty done right.
Newton's Gravity-Defying Puzzle
Best selling puzzle gift at Greg Puzzles. It brings some shock value and fun to any group.
Infinity Chocolate
Classic trick puzzle.
Classics / Traditional Puzzles
Puzzles that predate the modern mechanical puzzle scene by decades or centuries. The math and elegance still hold up.
Tangram
One of the oldest puzzles. MANY challenges.
Ostomachion
THE oldest puzzle. Harder than it looks.
Peg Solitaire
Another classic puzzle idea.
Frequently Asked Questions
What is a mechanical puzzle?
A physical object you manipulate with your hands to reach a goal - taking it apart, putting it back together, or packing pieces into a frame. The main families are interlocking puzzles, packing puzzles, and take-apart-and-reassemble puzzles (TICs). Every family rewards patience and pattern recognition rather than force.
What is the hardest type of mechanical puzzle?
There is no single answer. Every type can have puzzles harder or easier, and some types may be harder or easier depending on the solver. High-level TICs for example, can push experienced solvers very far. Andrew Crowell's advanced TICs can sit unsolved for weeks because the disassembly sequence is deeply hidden - a single cube face may need lots of moves before the first piece releases. If you want the deep end of the pool, the extremely difficult collection is where to start.
What is the best mechanical puzzle for beginners?
Start with the easy puzzles collection. For more advanced thinkers, an entry-level Osanori Yamamoto design or a small Frederic Boucher packing puzzle gives you a proper aha moment in one sitting without weeks of frustration.
Are 3D-printed mechanical puzzles good quality?
Well, it depends if the manufacturer takes his craft seriously. Modern printing holds tolerances tight enough that pieces slide with the precision the puzzle needs. But there is many nuance that only experienced puzzle solvers can understand in the solving process. Every puzzle in our 3D printed collection is printed and finished in Prague. Our producer and tester, Puzzle Guy, owns a 2.5M+ followers YouTube channel and solved thousands of puzzles in his life.
Cheap 3D-printed puzzles on marketplaces are a different story - the print lines catch, the pieces bind, and the puzzle stops being fun. We take the production quality very seriously, because a badly produced puzzle WILL ruin the fun and the puzzle.
How long does it take to solve a mechanical puzzle?
Anywhere from ten minutes to several weeks. A Level 1 Hanayama Cast might fall in one sitting. A high-level TIC or a Puzzle Guy sequential discovery can live on your desk for a month. Solve time is not a measure of quality, though - a puzzle that clicks in twenty minutes but leaves you smiling is doing its job just as well as one that takes ten hours. Each person will have their own preference of time they're willing to invest into one puzzle.
Can mechanical puzzles be reset and re-solved?
It depends on the type. TICs and some packing puzzles are built for it - the whole point is disassembly and reassembly, and they stay interesting because your hands forget the exact sequence between solves. Hanayama Cast puzzles are easily enjoyable for a long time too, as you can easily introeduce them to your friends. Sequential discovery puzzles are the exception: once you know the hidden path, the surprise is gone, and they become objects you show friends rather than solve again, and maybe display in your collection.
What makes a mechanical puzzle well-designed?
Four things: a satisfying sequence where steps feel earned, minimal design with no wasted resources, movement that is smooth and precise rather than sticky or forced, and replay value that survives knowing the solution. The best mechanical puzzles feel inevitable once you finish them - as if there was no other way the pieces could have gone together. But before, they seem like they shouldn't exist.