The Devil's Calculator

Logic puzzles about decoding the buttons on a demon-possessed calculator

Christopher Cinq-Mars Jarvis · Published by Cinq-Mars Media · Released Feb 18, 2019

Reviews: Very Positive; 96% of 97
Recent reviews: Not enough recent
Players: 0; daily peak, Oct 29, 2026
Steam Deck: Unsupported
Last update on Steam: 3 years ago; Jun 19, 2023
Minimum PC: 0.5 GB RAM · 0.3 GB disk; Full requirements

What is The Devil's Calculator?

In this single-player math puzzle game, you work through levels to rid a calculator of demons. You test inputs to uncover the rules behind its altered arithmetic buttons, then use them to produce 666. Graphing tools help you work out the hidden functions.

For you if...

+you enjoy testing hypotheses and reverse-engineering unfamiliar rules
+you want to create your own mathematical puzzles

Not for you if...

−you prefer puzzles without algebra or repeated calculations

What players say

96% of 97 reviews are positive

Players praise the mathematical challenge and puzzle design. Some find the calculator interface cumbersome.

Screenshots and trailer

The Devil's Calculator system requirements

Minimum: 0.5 GB RAM, 0.3 GB of disk space.

As published by the developer.

Can my PC run The Devil's Calculator?

The published requirements do not name a graphics card we can compare.

Set up my PC →

Minimum

OS: Windows 7 and later
Processor: An Intel Pentium 4 processor or later that's SSE2 capable.
Memory: 512 MB RAM
Storage: 320 MB available space

Does The Devil's Calculator have co-op or multiplayer?

No: single-player only, no multiplayer modes declared.

Single-player

Does The Devil's Calculator run on Steam Deck?

Unsupported No: Valve rates it Unsupported on Steam Deck.

Not supported on SteamOS

PC version details

DRM: None declared on Steam
Controller: Keyboard and mouse
Platforms: Windows, macOS, Linux
Steam features: Family Sharing
Languages: Full audio: English.

Does The Devil's Calculator use AI-generated content?

No AI-generated content is disclosed on the game's Steam page.

Self-reported by the developer under Steam rules: it covers AI content that ships in the game, not tools used to make it. Steam page checked on Oct 27, 2026. How to filter AI games on Steam