The objective of Surf's Paradise But Danger Below! is to stay on top of a wave as long as possible, while avoiding a shark that will approach at irregular intervals. The longer the player stays on the wave, the higher their score will be.
The game is divided into two parts: the surfing sequence and an underwater sequence. In the surfing sequence, the player must navigate the wave without falling off, while also dealing with the threat of the shark. If the player falls off or is caught by the shark, they will lose a life. The underwater sequence takes place when the player jumps into the water after being attacked by the shark, and requires them to reach the top of the screen before time runs out.
The game rewards players for their persistence and skill, with extra lives awarded for every 1000 points scored. With increasing difficulty levels and a limited amount of time available in each sequence, Surf's Paradise But Danger Below! is a challenging and exciting action-adventure game that will keep players on the edge of their seats.