You must quickly collect 80 gold to earn a "Gold " rank. Note that each of the gold stacks begin at three gold but will increase by one each time you build or upgrade a store. Begin by collecting the supplies that are blocking the path to the gold stack that respawns at the bottom of the screen. Only take collect that gold when the stack is at five gold. Upgrade your house as soon as possible. You should now be clearing the path with two workers. Build two stores closest to the gold stack to increment the gold to five before collecting it. Afterwards, build the statue to increase the speed of all your workers. While that gold stack is respawns, build and upgrade all your stores and the next time you collect the gold it will be worth fifteen. The gold stacks at the top will also be worth fifteen pieces each. After Hercules removes the boulders at the top, you will have access to two additional gold stacks there.