An apprentice herder named Gerdy sets out on a journey to free his father from the clutches of a malicious curse. His voyage takes him through an island comprising a variety of areas. Various wild creatures inhabit it, including a complicated and interrelated food chain. Gerdy needs to develop his herding abilities to compete in a tournament and earn the title of Master Herder to get revenge on the man who wronged his father and bring goodness back to the island.
Herdy Gerdy is essentially a platform game but also contains aspects of strategy and puzzles. Gerdy must navigate dangerous environments at each level by performing timed leaps and avoiding or eliminating various objects. On the other hand, a sizeable chunk of the gameplay consists of gathering different animals and guiding them down a road to safety, analogous to Lemmings. Because each creature has its unique demeanor and capabilities, such as swimming, the player will need to employ various strategies to catch them successfully.