Loosely based on the Greek myth of the Argonauts, Argo focuses on its central protagonist Iason (Jason), narrating a simple story that does not quite correspond to the known myth: Iason's father has been poisoned, and his native city Iolkos overrun by monsters known as Pontos. Iason must single-handedly eliminate them and save his homeland.
Argo is a role-playing game set in a pseudo-3D continuous world. The player explores the environments from a first-person view. It is possible to try to talk to any encountered character, as well as attack anyone. Most battles take place within the exploration area and involve a fairly simple turn-based exchange of attacks. However, occasional fights against larger monsters take place on a separate screen, have an over-the-shoulder third-person perspective, and require the player to move and attack in real time. Experience points and gold are awarded for defeating enemies. It is necessary to feed the protagonist; when his condition is "hungry" food also restores a portion of his hit points.