ICE Challenge 2023-24 Secondary Division Screening Round

I saw some tower have fire or ice on top. How can I do that?
冰冻堡垒 - 學習 Python, JavaScript, HTML 的程式開發 _ CodeCombat - Google Chrome 24_3_2024 2_06_53

Hi @Xray! Welcome to the CodeCombat Discourse! This is a safe place to chat and ask for level help. Before you begin your journey, could you please go through our rules that make this discourse an awesome place? It helps us all :grin:

Now, with that out of the way, could you elaborate more on your issue? And is there any code that is causing this error?