The Devil's Calculator: A Math Puzzle Game

Great and very addictive. I had some problems with upgrading and got awesome service from the dev. It is somewhat geared towards people with at least some mathematics background(it helps to understand what a function is), but the problems can be solved with pure logic as well. Hint: get a pencil and a piece of paper. The levels soon gets too tricky to solve in your head, like I tried to do.

I love math and do cambridge. This game allowed me to think outside the box and challenged me in a way the school's educational system does not and (to some extent) can not. Pity the actual calculator it provides for you does not work as effectively as the standard (physical) calculator or phone calculator. Overall it is a very unique and clever concept, with a nice execution. I had a really great experience and recommend this to anyone who would want a mathematical challenge.

Fun puzzle game all about numerals. I enjoy the non-algebraic puzzles, always a fun realization. The built-in normal calculator isn't great, it fails to register button inputs a lot, and it doesn't let you chain calculations together like you would expect. Also, the note taking screen doesn't let you set your cursor, so it's much better to have a pen and paper on hand when you play.

I find all of the levels really fun and it makes you use your brain. My favorite aspect of the game is the funny story that comes along with it. It's also well-explained how to play with quite basic rules but fun challenging questions. Most of all it's ad-free. Also it's totally free to go past Level 23 for students.

This game is simple to understand and challenges you in a way that doesn't feel hopeless. I would highly this if you like puzzles, want to practice your algebra and critical thinking, or if you just like problem solving in general. The only complaint I have is that there isn't really a menu that lists all the levels that you have completed; for instance, if you want to return to a level that you've skipped, you'll have to recall that level's number off the top of your head.

the game is fun so far, although a bit wonky/unresponsive here and there. i am wondering how i get the free upgrade?(im a student) and if the game is also free for students on steam. edit: it was really easy to get the key with my student email, so nevermind! I will say this though, i wish the game ran a bit better on mobile, as that'd be my preferred way to play. It's not that bad really, just a bit slow. Eg when I tap buttons, they aren't immediately reactive. Other than that, great game.

Great game but I found the calculator extremely frustrating because it does new operations on the last entered number rather than the answer of your previous calculation. So if I enter 2*3= and then +4, it will calculate 3+4 instead of 6+4. Since there are no brackets, some calculations can't be done in one expression either.

This game is a wonderful tool for developing problem solving skills and thinking outside the box when it comes to math related problems. I highly recommend people atleast trying this out, because they will 100% get attached to it pretty quickly. Hell, I even recommended this game to my friend and he Loves it!!

A thoroughly engaging and well-put-together puzzle game. Enjoyed it from start to finish. And the people who maintain it have been very helpful with the very minor issues I've had running it. Stellar performance all around, and highly recommended.

This game is awesome! It's the most creative and challenging math game I've found in years. I recommend keeping pen and paper nearby so you can take notes while you try to figure out the pattern (helpful, but not necessary).

This game is the most interesting math game I've ever played. It doesn't force you any ads and just asks for i believe 4 dollars after stage 14-18, i do not remember. But the game is very fascinating and addictive yet very challenging. And once you get that number 666 after trying combinations for 30 minutes, you will feel all the dopamine you could want. 11/10 would reccomend to any bored people who just wants to look at interesting math.

Great way to pass the time. Starts off slow, but definitely becomes a challenge. Great brain teaser and simple UI.

A superb mathematical problem solving game, demanding patience ,perseverance, trial and error and pattern spotting. And it's fun!

I love this game. i played it all the through finding it to be a great brain teaser game without being too difficult or tedious. Its definately for those who love everything math.

A proper challenge! Having buttons unusable really makes you think, even after you've worked out the pattern.

Tricky application, could not able to solve after level 4, thanks to thr video published by puzzle adda. I solved it till level 8 now. Hope Puzzle Adda will upload more videos in future of this app.

This is a clean and really fun challenging puzzle game. I like it a lot, haven't used any guides yet (lvl 20)

Fantastic game, unfortunately the latest update just gives a white screen. Thankfully the Devs seem aware and are working hard to fix it, Thank you Devs.

I absolutely love the game, only time I've actually ever downloaded a game after seeing the ad. Game has well designed ux+graphics. 💯% recommend

Stuck in an ad. Played 7 levels and now I'm stuck in Synonmy ad limbo. I can't press the back button.

An unexpectedly awesome game. Never thought I'd enjoy any game involving a calculator, but here we are! Runs well and looks good, too.

Great game, actually gets you to think outside the box and to think mathematically while still being a fun experience.

Amusing concept, very fun puzzles, best math game on Android! My only complaint is that my school email isn't working to get the full game.

Installed the app, opened it and all the buttons were greyed out except for the 'Next' button. Pressed next several times until it stopped cycling through the confusing video/cartoon clips

I like the graphics, I like the concept, I like everything about this game! This game teaches how to reverse-engineer functions.

A fun and mentally challenging game, give it a shot if you like puzzles!

Devilishly addicting; created by sick minds to cause frustrating enjoyment. I swear I can put it down, right after this level...

This is the best introduction to recursive functions and review of arithmetic i have seen in quite some time.