Google Senior Software Developer interview questions

Got HR call several days after submitting application, standard questions about myself and why google. First round technical phone call was about a design of a game, I got confused initially when I hear "design a game" as I was not prepared for a "system design" type interview, after a quick clarification, I formulated the problem into a graph problem and successfully solved it, interviewer then went on and asked some graph theoretical questions. The one-site consisted of 3 coding, 1 system, and 1 behavior. Codings were not standard LC questions as they require candidate to define the tasks and input. I completely bombed the system design interview.