|The following information is from the Adventure Time comic book series.|
It may not be part of the same canon or continuity as the animated series.
The Hall of Just Ice is a dungeon created by Ice King for an unknown master plan by him and Hunson Abadeer, but he abandoned it about 200 years ago for unknown reasons. It is designed to test heroes and allegedly there are prizes at the end for anyone who can get there.
Ice King created the dungeon while going through troubles about his relationships with others and it shows in the dungeon. At the main door to the Hall of Just Ice is an abstract statue Ice King made called "Why Oh Why Do I Have Problems Interacting With Women, Is It Because Something Is Broken With Me??" Also, all the monsters Ice King made for the dungeon are female. He even made a giant version of Ice Queen.
It hides Simon's greatest treasure, a picture of him and Betty.
- The Hall of Just Ice is an obvious parody of the Justice League's Hall of Justice.