Answer: Jordan vs. Bird
Michael Jordan first made an official appearance in 1988's "Jordan vs. Bird: One on One" by Electronic Arts. He could not be featured in prior NBA-based games due to opting out of the NBA Players Association.

Answer: World Health Organization
In relation to videogames, the WHO defines gaming disorder as "a pattern of... behavior characterized by impaired control over gaming, increasing priority given to gaming over other activities to the extent that gaming takes precedence... and continuation or escalation of gaming despite the occurrence of negative consequences."

Answer: Galaga
While aboard the Helicarrier, Tony Stark hilariously calls out a SHIELD employee for playing Galaga, making it one of the most-memorable moments in "the Avengers".

Answer: Wario
In the 15+ games that makeup the "Mario Party" series, only "Mario Party Advance" didn't feature Wario.

Answer: Gold farming
Some people, particularly in developing countries, actually make a livable income from gold mining videogame currencies.

Answer: Space Invaders
Originating in 1978, as of the beginning of 2019 the "Space Invaders" franchise has generated almost $14 billion in revenue.

Answer: Metal Gear
Solid Snake has starred in a number of games that are part of the "Metal Gear" series, including the original released in 1987.

Answer: Kirby
As can probably be ascertained by his simple appearance, Kirby is the one that was original intended to be a circular placeholder for another character.

Answer: World Joyland
World Joyland, located in China, is based on "World of Warcraft" and "StarCraft" despite having no formal agreement with its developers, Blizzard Entertainment.

Answer: Artificial Intelligence
Since classic games like "Space Invaders", "Galaxian" and "Pac-Man" successfully implemented artificial intelligence decades ago, it was become a stable in the videogame industry.