運任せの召喚士 is a free casual tower defense game available on iPhone that emphasizes luck and strategy. Players summon various creatures through random generation, with the potential for powerful allies to emerge and turn the tide of battle. The gameplay encourages players to tap to summon and strategically deploy their summoned creatures against waves of enemies, enhancing the cooperative experience with friends while managing resources and unit placements.

The game's mechanics offer a simple approach that belies its strategic depth. Players can combine summoned creatures to create stronger allies or sell them for additional summons. Each creature possesses unique skills and abilities, and managing these within the constraints of deck costs adds layers of strategy. With a balance of luck and tactical decision-making, players must navigate through challenges, making every game session uniquely engaging.