Based on your requirements, I would like to understand what are your objectives so that I can do a more thorough research for you.
For example, in Singapore itself, the term "Baby Shark" is the most searched term on Youtube for the past 12 months. However, depending on your video game's target audience (presumably Millennial males), the top search terms are "Infinity comic book", "FIFA 18" and "Avengers Infinity War".
By understanding your needs better, I can summarise what you need based strictly on data. I am a professional digital marketer and will be able to help you pin point the right strategy at producing relevant content and targeting customers effectively. Hope to hear from you soon.