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 customized "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.