Euclidea
November 05, 2025
More About Euclidea
10 Innovative Tools
"Explore" Mode and Hints
Easily Drag, Zoom & Pan
New levels are unlocked as you solve the previous ones. You can complete the whole game only if you earn all the stars. But you can buy an IAP that removes this restriction.
“Euclidea has been shown to help with imagination, intuition, and logic, all wonderful skills to develop.” – appPicker
“Euclidea is an absolute joy to play…it’s a game that every math student should have and, in an ideal world, every adult should like.” – Non-Trivial Games
***About Euclidea***
Euclidea is a brilliantly original way to learn about, explore and have fun with Euclidian Constructions! Your task is to solve interesting challenges by building geometric constructions with a straightedge and compass. If you design the most elegantly simple solutions in the least number of moves, you’ll earn the highest scores. Solutions are scored in lines (L) and elementary Euclidean constructions (E).
***Start Simple and Get Smarter!***
Don’t worry if you aren’t a math wizard. Euclidea starts out with simple challenges that guide you through the basics. Once you master the fundamentals, you’ll move on to tougher, more mind-bending challenges such as inner/outer tangents, regular polygons, and more. There are 120 unique challenges in total, which are organized in packs for simpler navigation.
***Add Constructions to Your Interface***
When you learn certain significant constructions – such as angle bisectors, non-collapsing compass, and so on – they are automatically added to the Euclidea interface’s shortcut, which helps you save time and allows you to create clean, uncluttered drawings.
***Easily Drag, Pan & Zoom***
Euclidea-created constructions are completely dynamic. As such, you can drag to adjust angles, lines, radii and so on. You can also easily zoom and pan. This not only makes the experience more interactive, but it allows you to more deeply grasp the relationships between geometric elements, explore various possibilities, and analyze errors.
***Instant, Automatic Precision***
Don’t worry about spending time or effort trying to achieve perfect precision, because Euclidea automatically handles that task by pinning points, lines and circles to the app’s clean interface.
***Additional Special Features***
> A helpful “Explore” mode that allows you to see the figure you need to construct
> An inventory of tools that you create as you progress – you’ll need these to solve future challenges
> Some challenges can be solved in more than one way, which means you can try a different approach and have even more fun
***Questions? Comments?
Send in your inquiries and stay up-to-date on the latest Euclidea news at https://www.euclidea.xyz/
Latest Version
4.58
November 05, 2025
HORIS INTERNATIONAL LIMITED
Puzzle
Android
3,570,062
Free
com.hil_hk.euclidea
Report a Problem
User Reviews
Craig Young
3 years ago
Five stars, because this is literally the most useful and educational game in the app store. But I do agree with others who say that it is too hard. Perhaps add diagrams or tutorials. We are not euclid... Though we appreciate the opportunity to discover these properties of geometry on our own, we ask that a walkthrough would be built into the game. 10/10 stars if you are able to demonstrate these constructions the same way eclid did.
A Google user
6 years ago
I'm a math major, and I just took geometry. It's like all of the things i liked about my class (the eureka moments and pretty pictures) without the stuff I was less enthused about (proofs and stress). This is relaxing to me, makes me feel smart, is mentally stimulating, and is kinda fun. It's hard, but not frustrating, and not competitive (aka stressful). Unusually good User Interface!!! I don't usually take time out of my life to write praise, which means Euclidia is *that* stellar!
A Google user
6 years ago
Great concept. It felt closer to 3 or 4 star. I'm rating it 5. I want to encourage the devs and competitive devs to make more games based in forms of mathematics geared towards adults... the controls feel counterintuitive when you have CAD/Inventor functionality ingrained in your subconscious. It leaves the puzzles feeling harder than they are. Without a glimpse at the available tools in the late-game I can't determine if it becomes less about technicality and more about the geometry involved.
neverbored3
4 years ago
I AM LEARNING! Maybe it's my ocd brain, but this is fascinating. There are some levels that seem sort of obvious to me, because I understand intuitively how shapes fit together. But other stages blow my mind, and I have to look the solutions up. But I don't just copy the answer and move on. I sit and watch the solution unfold, and try to understand how one shape leads to the next. Then try the level some more to see if I now get the principles. I'm getting better at geometry through this!
Camilla Thomas
4 years ago
Beautiful concept, and in general I like the UI. However, I would much rather pay $8 straight up like Dragonbox, and like Dragonbox, have the option to watch an animation of the solution when I get stuck, than dribble out a dollar here, a dollar there, and no real help or explanation. This game desperately needs an in-depth explanation of why each thing works, to encourage real learning. I get stuck and the hints don't help. They only link to complicated articles on Wikipedia.
Seth Anderson
5 years ago
This game is really cool. I found geometry out of indifference in high school. This game had shown me how fun it is. Racking your brain to discover hidden gems in the world. I even bought a drawing compass to practice each time I discover a new one. The controls can be difficult. Zooming and clicking the right spots in a cramped space. But they're as good as I can imagine them to be. I'm not an app developer. A relaxing puzzler that has guaranteed I'm going to take some math courses.
A Google user
6 years ago
This is one of the coolest "games" ive every played. I love puzzles and geometry, and this gave me real insight into the fundamental principles on which geometry is founded. The game allows you to "discover" fundamental geometric relationships. This is a really valuable and important way to learn and really understand geometry rather that just memorize rules.
Sasuke Sexy_66
3 years ago
GREAT game. Best pure puzzles I've seen in a LONG time. I just beat the first two packs. Hopefully I remember to update this after I've confirmed this but I imagine the "Useful Fact" hints are more valuable than the others (I didn't use any of the useful fact hints and knowing what tools to use in what order didn't really help since I didn't know how to use them).
A Google user
6 years ago
Wonderful brain teaser game. I had to buy the $0.99 unlock upgrade or I would have been forever frustrated and stuck. Given enough moves, i was able to solve any construction. But unless you can solve the construction in the required minimum number of moves, you are not allowed to advance to the next level.... unless you've bought the $0.99 unlock upgrade.
Josh Nagy
3 years ago
This is a great game concept but the monetization implementation was a poor choice. The game is worth paying for out of the gate but presenting at a free game and then holding almost 90% of the game behind either getting all secret and variant solutions in the first 2 levels or paying money is a classic bait and switch. Regardless of the merits of the game, I can't forgive dark patterns.
Toma Dimitriu
3 years ago
it's exactly what it appears to be: geometric construction problems in a puzzle game format. it's simple without being trivial. the app is well designed (features and layout are satisfying, intuitive, and polished). it has a dark theme! i'm glad there's an option to send the devs a dollar without unlocking the game because i think they deserve it even though i like to unlock the levels one by one.
Damian Johnson
5 years ago
Before you slam with a bad review, the intent of the game is asking you to derive geometry the way Euclid did. It is designed to be very difficult. The hint here is each level generates a general rule ;) (axiom), you will need for later puzzles. Each tool points represent the theroetical minimal possible moves to solve. This always has and always will be the inherent goal of the mathmatician. That being said, this game is perfection.
A Google user
5 years ago
Best game on the play store that I've seen. The puzzles seem very challenging so far, and I'm only on the 3rd section. However, they are fun to think about so I do not find it frustrating to get stuck on a puzzle. In each puzzle there are 3 stars to unlock, along with an additional 4th on some. The first star is just doing the construction, the second is to do it in the least number of steps, the third is to do in the most efficient way possible, and the 4th is to find all alternative solutions.
A Google user
6 years ago
I absolutely love the game. I do wish that there was a mathematical explanation to the completion of every level. As I get further the levels get harder; I know what information I need but not how to look it up. Maybe some formulas or something to help conceptualize the level. Could we get a free play blank sheet level that has no objection, just an area to experiment with the tools. That would be cool. Thank you!
A Google user
6 years ago
Certainly looking forward to the hints system, but this game has been great nonetheless. I thought I hated geometry, but I just hated geometry class, i.e. the proofs. This game is fascinating and challenging and really keeps me on my toes mentally. The only possible improvement I could think of would be to add a sandbox mode; a blank grid where you can experiment to your heart's content.
Olivia Gillham
9 months ago
The game I needed to understand trigonometry 🤯 I wish I'd had this 20 years ago, when I was learning trig in high school and couldn't find an explanation that made it "click" for me the way most other math did. I've just been playing through the game so far, but I can tell that when I next go to memorize a trig rule, I'm going to have a better intuitive understanding of what it *means*, which will mean I can *learn* it rather than just memorizing 🤩
Ernest
4 years ago
I have never enjoyed a game so much, and at the same time learned so much from it. The controls are effortless and intuitive, and the puzzles make you feel like you're the true discoverer of geometric relationships... Because in a sense you are. And levels 3-8 unlock with stars, or you can buy them outright for a dollar. An absolute steal for such an incredible game, and if you're really invested you don't even have to pay that. I can't praise this enough!
AJ
5 years ago
This game reminded me how cool geometry is! It's like a brain teaser but so calming! I love it. I wish I understood the way the "E" and "L" "cost" works. It is nice being able to drag or pull circles and lines and the "cost" shows up at the bottom, but if they somehow could show the cost above each shape/line/etc that would be helpful in my problem solving!
A Google user
5 years ago
The game could offer a bit more help, especially when first starting. Also offer help throughout the game. I understand that part of the experience is to figure it out on your own, but sometimes getting lost on a problem with no help is very frusterating, and without the answer, you can't progress to the next problem...other than that, it is a great designed game and is unique in every single way and different from any other game I've ever encountered. Thank you to the developers and great job!
Chad Roberts
2 months ago
I love the concept of this game but I think the execution could be improved a little. Biggest way to improve the game would be to give me the option to pick the color for each line, and the ability to show or hide certain colored lines. once I establish the actual line or circle I need, it would be nice to have a way to filter out the lines that I only used to get there.
