Sand Truck challenges dye stream navigation across sprawling assembly lines. Switch valves precisely to fill hue-specific haulers before overflows. Warehouse buffers save excess for later demands. Dynamic day-night shifts alter pipe visibilities. Earn automation bots and super silos from stars. Strategic planning thwarts chaotic jams effortlessly. Perfect for puzzle enthusiasts craving depth. Invite buddies to co-op factory designs! Control pins to guide sand into correct trucks or storage.