"Defenders of Oasis" is a role-playing game in which the player controls the Prince of Shadam, who must defeat the empire that has attacked his kingdom. The Prince is initially solitary, but forms a party including three other characters over the course of the game. The game is played from an overhead perspective, and the setting includes several villages and castles, in which the Prince is capable of conversing with pedestrians and collecting objects. Each village includes at least one shop where the player can purchase and sell items that can aid the Prince and his party, such as weapons, armor, and accessories. Villages also include a certain place where the party can rest and recover their hit points and spell points.