Gold

Gold is the common currency in King's Quest: Mask of Eternity. Gold consists of gold coins found hidden all over the world and dropped by enemies.

Background
According to the manual;
 * As Connor travels he will find gold hidden in places, and will find that some monsters will drop gold when they die. Make sure you take any gold you find. There are several places throughout the game where you’ll be able to buy items and information. To use the gold, click on the gold icon on the interface. The cursor turns into gold coins. Now click where you want to use it. If you have enough gold in your inventory, your gold will automatically be reduced by the proper amount and the exchange will be made.