You can call a video game you played simply "a video game," or you might refer to it by its specific title. Additionally, you could describe it in terms of its genre (e.g., action, role-playing, puzzle) or your experience with it (e.g., "an immersive game," "a challenging game"). If you want to share your feelings about it, terms like "favorite game," "nostalgic game," or "memorable game" could also be used.