GTA: Shore Siege 2
Every pirates dreams of having lots of treasure and spending it all to their heart contents. They don't want to save some for the future as there would be more. When the treasures runs out, they know that it is time for them to get more treasures. However, the islands were the treasures can be found are full of monsters. Try to build as many oil rig as start of the game. You would need oil to buy weapons. Enemy comes in wave, so build defenses to protect your oil rigs. You can also unleash the Kraken to help with your campaign.