The game has 5 different types of resources: gold, wood, steel, oil and banknotes.
Gold can be earned from beach houses on your island, by winning battles and also from the islanders you liberate, who will deliver gold to your island by boat to thank you. You can use gold to upgrade your troops, mines, your Destroyer’s abilities, explore new regions, clear obstacles from your island and also pay to launch attacks on enemy islands.
Wood, steel and oil are a reward for winning battles and are also produced on your island. These resources are used for building structures and upgrading them on your island.
Banknotes are the in-game currency that helps you buy missing resources, speed up various processes and develop your base more quickly! Banknotes can be found for free or bought.