"Phantom Beast Card" is a casual, puzzle-style card game. Players use a combination of game cards, eudemons cards, constellation cards, and magic cards to defeat monsters and pass levels. If the monster is not defeated within a limited number of moves, the level is failed. There is no time limit in the game, allowing players to think carefully before making a move. The damage inflicted by moves, combined with the effects of eudemons card, is used to calculate the total damage. Clearing a level rewards players with coins, which can be spent in the shop. The shop sells privilege cards, eudemons cards, magic cards, constellation cards, and enhanced game cards, along with special card packs. The inventory in the shop changes periodically, and seizing the right opportunities is key to ultimate victory. The card packs are designed with a multiple-choice option, allowing players to easily select the cards they need most. After perfectly clearing a level, players can continue to challenge themselves and enjoy the game.