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Play OverviewPlay Overview

The Devil's Calculator (2019) is a mathematical puzzle full of logic brain teasers. An evil calculator has its normal arithmetic operators replaced with sadistically obscure functions. You must figure out (with logic and a bit of algebra) how to use these corrupted operators.

Play involves discovering what each mysterious operator does on the calculator so you get get the result 666 and move on to the next level. This starts with trial and error. You enter a number then press the mystery function to see the result. In this way you build up information to help you identify what the function does. As soon as you are able to get the "666" result you move to the next level.

This starts simply, with early functions simply adding a number to the result. But as you progress the function becomes more complex. Also, different keys are on fire and can't be used. With this increased challenge you get different ways to visualise your test results on graphs.

The result is an unusual and engaging way to learn a range of different mathematical processes and methods.

Our examiner, Andy Robertson, first checked The Devil's Calculator 2 years ago. It was re-examined by Rob Prior and updated 21 months ago.
Too complex for your family? There are lots of games similar to The Devil's Calculator. Here are some easier younger-rated games:

Play StylePlay Style

This is a Brain Game and Narrative game with Puzzle elements. This is a single-player game.

You can play this game in the following styles:


Play Time: It takes between 1 minute and 5 minutes to play a round of this game.

Age RatingsAge Ratings

Content Rating

This game has been rated PEGI 3.

Skill Level

12+ year-olds usually have the required skill to enjoy this game. Still, it’s important for parents and guardians to ensure they understand in-game purchases and have spending limits set-up.


The Devil's Calculator usually costs £0 to £2.49. 

The Devil's Calculator

Steam Store PC £2.49
Steam Store Mac £2.49

The Devil's Calulator

Steam Store PC Free
App Store iOS Free
Android Store Android Free
This game is free to play, but there are other costs associated with this game:
  • In-Game Purchases: Additional in-game purchases are offered for items that enhance the experience.
The first 20+ levels are free to play and enjoy in the game's Demo. 
It's important to set up your accounts and devices appropriately. More information is on our Financial Resources page.

DetailsGame Details

Release Date: 28/01/2019

Price: Free

Out Now: Android, PC and iOS

Skill Rating: 12+ year-olds

Players: 1

Genres: Brain Game, Narrative and Puzzle

Accessibility: 0 features documented

Components: 2D Side-On and Grid

Taming Gaming Book Written by parents for parents, the database complements the in-depth discussion about video game addiction, violence, spending and online safety in the Taming Gaming book. We are an editorially independent, free resource without adverts that is supported by partnerships.

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