Events Demon's Souls take place in a fictional world whose architecture is inspired by Europe. The gameplay begins with the creation of the main character. The player can choose a class, name and customize several appearance elements. After this, the character finds himself in the kingdom of Boletaria, over which a fog of dark power hangs, creating demons that kill people and destroy cities.

The gameplay of the Guardian Demon project is focused on battles with a variety of enemies greedy for human souls. The game world is open for exploration, and progression can be non-linear. The user himself chooses which locations to study, whether to let opponents through or try to kill obviously strong opponents. There is a multiplayer system that allows you to leave messages for other gamers in certain places for their single playthroughs.

The character has numerous characteristics that affect his movement, defense, elemental damage and other features. 80% of the enemies in the game are obviously strong, like mini-bosses. Also, each enemy has its own set of attacking and defensive skills, combinations, blocks or magical abilities. The user can use melee and ranged weapons, as well as additional consumables such as potions, enhancements and accessories in the form of rings.