【撼天神塔】Brandish2 如何离开地牢？

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身上有钥匙，但是对门使用还是显示不能打开？

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Kill enemies that you see and use the Master Keys when you get them to open locked doors and chests. When you find the Skull Key, you use that key where you fight the two Prison
Jailers, north of where you first started. There you fight the first boss of the game, the Prison Guard. This guy is pretty tough, but he's not that hard once you do a little hit and run tactic. Go to the Bestiary section if you want a more in depth strategy to beat him. Take his sword when you beat him and go get the Green Key in the next room. Forget about that locked door too, it leads to the Laboratory level which is far away from now so backtrack
to the locked door on your way to get to the Prison Guard and use the Green Key to unlock it and move on to the second area of the Prison. Also, forget about the bottom right part of the map as well. That locked door is the Elevator, which you will not use until you return to the Prison once again.

Master Keys  打不开那四张门，   Skull Key 也不知道哪找到？