Yoshi Valley is the second track of the Special Cup in Mario Kart 64, as well as the last track in the Leaf Cup in Mario Kart 8. It is often considered one of the most difficult courses in the Mario Kart Series. It belongs to Yoshi.
The course starts out on a dirt road with grass on the sides, like DK's Jungle Parkway. After a bit, it transitions into a winding maze of roads on cliffs. These paths are very hard to navigate, even if the player's with another person. The paths eventually meet, and after a few turns, there is a bridge which takes the player back to the dirt road. Shortly after, the finish line is reached. The course itself has few railings. If the player falls off a cliff, he or she will roll down the hill for a few seconds. Lakitu will pick the racer up after he or she rolls all the way down to the bottom, making falls more costly than normal. Before the bridge there is a giant Yoshi Egg that spins across a small area. If it rolls over a player, he or she will be flattened, like a player run over a Thwomp or a Mega Mushroom. However, AI-controlled characters cannot be flattened by it. Also, there are black porcupines on some paths that will make one spin out if hit.
The complex-considered part of this track is that there is no telling who is in which place. Because there are so many different pathways that take the player to different parts of the course and perhaps because of resulting programming problems, the game simply replaces the usual positions with question marks, only revealing the standings for a racer after he or she has crossed the finish line.