The Devil's Calculator: A Twisted Logic Puzzle Adventure

9/12/2026, 8:35:03 AM

Release date: 2/18/2019

Tags: #puzzle #indie #logic #experimental #education #casual #strategy #hacking

User Reviews

Score: 96%Very Positive
Review Count: 123 reviews
Fetched At: 9/12/2026, 8:35:03 AM

Reference prices

Japan

¥ 350 (JPY)

Steam JP

$2.99 (USD)

Steam

Live Store Snapshot

Body text may reflect the state at publication time. For the latest sale, price, and review changes, prioritize the live price panel, review panel, and the Steam store listing.

Japan Price: ¥ 350
Global Price: $2.99
Price in Your Region: ¥ 350Prices as Steam lists them per country. What you are actually charged depends on your Steam account settings.Regional prices checked: 12 Sept 2026
Sale Status: Regular pricing
Price Checked At: 9/12/2026, 8:30:46 AM

Key highlight

The Devil's Calculator is a unique indie puzzle game where players decipher corrupted arithmetic operators to calculate the 'number of the beast,' 666. It offers an educational and addicting experience, with a free demo

Who this is for

Highly recommended for players who want to test their logical thinking and mathematical prowess. The thrill of unraveling the mysteries hidden within the devilish calculator is exceptional.

Details

Overview

The Devil's Calculator is a unique indie puzzle game that challenges players to think backward and decipher corrupted arithmetic operators. Instead of standard functions, you'll encounter obscure operations that must be understood through logic and a touch of algebra. The ultimate goal is to compute the 'number of the beast,' 666, to cleanse the calculator of its demonic influence. This non-profit, open-source title offers an experience that is both addicting and educational, making it accessible to a wide range of players, from seasoned number enthusiasts to those new to mathematical concepts.

Highlights

Original Puzzle Mechanics: Features a core gameplay loop centered around deciphering and utilizing obscure, corrupted mathematical operators.
Educational and Engaging: Blends challenging logic puzzles with algebraic concepts, offering a fun way to sharpen mathematical reasoning skills.
Accessible Demo: The first 20+ levels are available for free, allowing players to experience the core gameplay before committing to the full title.

Who It's For

This game is perfect for players who enjoy logic puzzles, brain teasers, and games that require deductive reasoning. It appeals to those who appreciate unique indie game concepts and educational experiences that don't feel like homework. Math novices and numberphiles alike will find something to enjoy in its challenging yet rewarding gameplay.

Game Info

Developed by Christopher Cinq-Mars Jarvis and published by Cinq-Mars Media, The Devil's Calculator was released on February 18, 2019. It is a paid title that supports family sharing and features multiplayer capabilities. The game is available in English and has garnered a 'Very Positive' reception from Steam users. Its genres include Puzzle, Indie, Logic, Experimental, Education, and Casual, with user tags reinforcing these categories.