Another angle: perhaps the user made a typo, like thinking "GX" has episode 163, but the main series doesn't. So correcting them and guiding them to the correct numbering and series would be helpful. It's important to clarify that the main GX has 130 episodes, and the rest are part of the World of the Memories.

Alternatively, if the user is referring to the main series mistakenly, then episode 163 isn't actually there, so I need to clarify that. Also, maybe there's a mix-up with the numbering. For example, some sources might number differently. But according to standard episode lists, GX has 130 main episodes. The World of the Memories is a separate part, so 163 is within that range.

Wait, maybe I'm confusing with the total number. Let me verify. The main Yu-Gi-Oh! GX series has 130 episodes. There's also a sub-series called "World of the Memories," which has about 30 episodes, but those are more of a recap or side stories. So episode 163 would actually fall into the World of the Memories part.

In summary, my response should explain that episode 163 is part of World of the Memories, which is separate from the main GX series, provide some context about that episode if possible, and suggest checking the title for accuracy. Also, offer to help further if they have specific questions about the episode's content.