再次降低了30天尸潮的难度
Reduced the difficulty of the 30-day corpse tide again

对地图类型做了调整，换成了比较亮的地图。
削弱了30天尸潮强度
修复了一些插图错误
The types of maps have been changed to brighter maps.
Decreased the intensity of the 30-day corpse tide.
Fixed some illustration errors.

对30天的尸潮进行优化处理，降低了难度
Optimizing the 30-day corpse tide reduces the difficulty.

移除了测试时候的全图效果，添加了几个外部建筑的小地图图标。
Remove the full map effect during the test and add several small map icons for external buildings.