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Apparently, there are only 3 places for you to store your cores: the warehouse, the cabin and the inner cabin. Imagine that if all these places can't hold more items, how will you deal with other cores? Talk to the Core Manager (Steel Warship 468,837), he will give you some suggestions.

Players can put advertisements to buy or sell cores via the Core Trade System.

Sell Core: Put in the core you have and select the price to sell.
Buy Core: Select the core type, the amount and the price you can afford to buy.
Gains: If someone buys your core, you can click and get your income.
Purchased: Check what you have bought. You can put the cores into your cabin.

Issue Buying Order

Select the core type, the amount and price you can afford, you can send the Purchase Order via the Core Trade System. If a suited core is available, the system will buy it for you automatically. Then you can just click Purchased button to get it.

Sell Cores

After put in the core and select the price, you can send the sale request via the Core Trade System. If someone#DY#s Purchase Order can meet your requirement, the system will sell your core to that guy automatically and keep your earned Zero Points. Then you just click Gains button to get your income.