1. A Sphinx: This creature posed a riddle to Harry that he had to solve in order to continue.
2. A giant spider: This spider was incredibly large and aggressive, and Harry had to use his wand to fend it off.
3. A dragon: This dragon was the final challenge in the maze. Harry had to use his cunning and knowledge of dragon behavior to outsmart it and reach the Triwizard Cup.
There were also other obstacles in the maze, like boggarts and other magical creatures, but these three were the most significant.