The Sun: Origin is a mobile survival RPG set in a radioactive wasteland. Players manage their character's health, hunger, and radiation levels while exploring hostile environments. Core gameplay involves real-time combat, scavenging for resources, and completing quests to progress the narrative.

Interaction is designed for touchscreens, with a virtual joystick for movement and action buttons for combat and looting. The game features an extensive inventory system and crafting mechanics to create essential gear. Players can also drive various vehicles to traverse the large open-world map.

Progression includes developing character skills, upgrading equipment, and engaging with different factions. The experience is a blend of exploration, tactical combat, and resource management, all adapted for mobile play sessions.