These are your main options when you enter the world of Idle Online Universe (IOU). You can also use Keyboard Shortcuts to access screens quickly.
Hunting is the main activity of Idle Online Universe, and the main source of Gold. Hunting always happens in one of ten Worlds, which can be traveled to by clicking this icon.
Expeditions are journeys on which you can send a ship in search of various currencies, also earning Expedition Points to upgrade your ships. This also includes the Ship Arena and Upgrade Lab.
Challenges is a special game mode that rewards Challenge Points, which when reaching certain numbers, reward Challenge Milestones and extra base damage.
The Orbs page allows you to unlock various soul orbs. You can make sacrifices to these orbs to gain bonuses in various areas.