The first five games of the top 10;
10: A piece of concept art from this series' very first game finally came to reality in this much, much newer game. Guessed by drbunnig - The Legend of Zelda: Breath of the Wild
9: At one point, you can visit the outside of the hub-world of another, related, game if you roll off the dedicated track. Guessed by UnderwaterFunktown - Mario Kart 64
8: Not broccoli, but llama's.
7: Featured a license agreement with a real company and the game included a bunch of their parks, but really, I could build better ones. Guessed by UnderwaterFunktown - RollerCoaster Tycoon 2
6: Though it's not explicitly mentioned anywhere, I'm sure each game in this series is based on a certain real-world country. It's not necessarily why I like it so much, but because of the 'year', the architecture of the buildings and the spice-trading theme I'm sure this one secretly references my home country.