Blue Crystal is one of the four basic types of Resources which can be gathered in Castle Story. Like Stone and Orange Crystal, it is extracted from the ground via the Mine and Tunnel commands in Sandbox mode, and from prebuilt Mines in Survival.
Blue crystal can be found within rocks in sandbox mode. They can be extracted by giving a Bricktron an order to either mine into the ground or tunnel into a mountain. Blue Crystal is stored in Barrels.
The only use of Blue Crystal is to bring it to the main crystal to allow the generation of more Bricktrons. Therefore, it is recommended that you do not store these crystals and put them to use immediately.
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