In Heroes Assemble, use your mouse to navigate menus and select heroes and pets to form your team. Click to assign heroes to battle positions and pair them with pets to enhance their abilities. Progress through dungeons by completing levels, using strategy to defeat enemies in turn-based combat. Collect resources and rewards by winning battles or exploring, and use them to upgrade heroes, unlock new abilities, or acquire pets. Engage in modes like boss battles or arenas by selecting them from the main menu, and cooperate or compete with other players in alliance or PvP modes. Manage resources wisely to strengthen your team and conquer challenging dungeons.