74%Strong matchBook of Demons
92%8k92% positive reviews, Very Positive across 8k reviews·Dungeon Crawler · Roguelike Deckbuilder
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An antique computer has granted you the ability to summon cyber demons. Seeking power from demons is like dancing on a tightrope, from Lawful Good to Chaotic Evil, how will you choose? Will you collude with the wealthy, politicians, stars, and artists, or change this decadent society?
Cyber Demon Protocol
SteamIn this game, you contract Cyber Demons, walking a precarious tightrope between risk and reward. Every day at midnight, the demons come to collect their due, demanding your core attributes: Constitution, Sanity, Appearance, Intelligence, Sociality, and Luck—as sacrifices.
In exchange, you harness their forbidden powers to navigate events, break deadlocks, or amass wealth.
Furthermore, your choices shape your Anonymity and Morality. These values determine your Alignment, which dictates your harmony with specific Cyber Demons and draws you toward key characters whose fates are intertwined with your own.
4/5 Title screen completed. Added a line chart for price fluctuations and a sorting function to the Assets interface.
4/18 Point allocation and naming interfaces are done. Dice animations are complete. Now developing a save/load system that includes timestamps.
4/28 Ending system completed. Designed using a database structure where each entry includes a name and, in the case of a death ending, the cause of death.
5/11 The map can now be expanded and collapsed, allowing player to toggle between full-screen and half-screen views. Currently grinding hard on the demon database!
In the year 2050, the world is plunged into an unprecedented crisis, with the Human Development Index in constant decline. New Sodom is a city-sized island whose citizens call themselves "White-Winged," symbolizing humans with the wings of the Covenant, the sole beacon of hope during the Great Regression.
You are a medical student who recently entered university. By chance, you gained the ability to summon demons—much like the elite figures responsible for the world's current state. Among contractors, some suffer misfortune because of demons, while others use their power to dominate society.
Cyber Demons cannot manifest gold coins out of thin air. Instead, they manipulate the flow of events. Essentially, human fate and luck. Humans can only perceive them through electronic devices. They seem to favor those capable of achieving great (or terrible) things.
Lucifuge Rofocale
A demon from the famous grimoire The Grand Grimoire (The Red Dragon), who contracted you through an antique computer. As the Chancellor of Hell, she should possess infinite wealth, yet for some reason, she demands cash from you in exchange for the power to alter the life and death of others. The cost of her mere manifestation was 66 years of your life, meaning your life is already a flickering candle in the wind at the start of the game.
Steam data © 2026 Valve Corporation. Trademarks are property of their respective owners.
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The best games like Cyber Demon Protocol are Book of Demons, Rogue Lords, The Eastern Sacrifice, Demonheart, and Cultist Simulator.
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