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Video GameThe Devil's Calculator Review
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Posted: 10 weeks ago, last updated 9 weeks ago.

Author: @GeekDadGamer and Jo Robertson.


The Devil's Calculator 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.

DetailsGame Details

Content Rating: PEGI 3

Skill Rating: 12+ year-olds

Release Date: 28/01/2019

Price: Free

Platforms: Android, PC and iOS

Genres: Brain Game, Narrative and Puzzle

Players: 1




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

Play StylePlay Style

This is a single-player game.

You can play this game in the following styles:

Age RatingsAge Ratings

Content Rating

This game has been rated PEGI 3.

Skill Rating

12+ year-olds usually have the required skill to enjoy this game.


The Devil's Calulator

Steam Store PC Free
App Store iOS Free
Android Store Android Free
This game is free to play. 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.


We haven't documented accessibility features for this game yet. Our The Devil's Calculator Accessibility Report details system-wide settings that may help, and suggests similar games with accessibility features.

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