In Culdcept, the player takes on the role of a Cepter. Cepters are beings that have the ability to use magical cards to summon creatures, cast spells, and perform various other feats of wizardry. As players advance through the game, they earn additional cards that they can use to create customised "books" (decks of 50 cards) with which to better defeat their foes.

Although the game is relatively intricate, it slowly nurtures the player through basic game concepts. By acting as an arbiter and automatically enforcing the rules game complexity is kept to manageable levels. After enough sessions, players should be able to figure out various strategies and be able to effectively practice deck optimization techniques.

Gameplay resembles Monopoly in that players roll a die (or two dice with certain spells) to move around on a game board. However, instead of buying the property and putting houses and hotels on it, players instead summon a creature to defend the property with cards—the Magic: The Gathering aspect of the game. If an opponent lands on a property that one owns, the opponent either pays a toll, or can choose to attack the defending creature with one of their own in order to attempt to take over the property. Unlike Monopoly, this can result in one losing a piece of land after considerable investment.

There are four property colors that represent different terrain types, e.g. green = forest. The more a player invests in the property to "level it up" (ala adding houses or a hotel in Monopoly), the more the terrain flourishes (e.g. forests become more dense with trees). This then provides additional defense to creatures of the matching color type, and exacts a higher toll on opponents landing there. And as a player collects more lands of the same color (creating "chains") the tolls, as well of the land values, increase.

Culdcept also includes item cards that can be played during battle to help attack, defend, or manipulate the battle in a number of other ways. Along with creature and item cards are spell cards that cause other various effects to creatures, territories, and Cepters.

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