Can someone help me? It keeps saying "Syntax Error" For 13, 14, or 15. What do I do? (I'm trying to make a battle scene in my game)

C1, C2 or C3 haven't been initialized. Also, you're not using the result of that operation... you must store it on a variable. Example VAR res=C1-RGB(0,256,0)

Ok, I did that. Now it's saying "Duplicate Variable" For 14, or 15. What do I do?

In my opinion, you should write '=' instead of '-' in line 13-22. Also I guess you don't need '-' in line 25-28.