Certain challenges have been eliminated from the Adventure repertoire based on how they have played out.
Kings in the Corner
Along a spider web ropes course, players moved along intersections turn by turn to block a team's KING player in. Theorectically this is possible. Due to confusion in rules, this challenge has never resulted in immunity. It has always been called a Draw.
Battleship, though a popular game with the players has resulted in a two way tie more than once, resulting in changes in the rules, such as double immunities and multiple eliminations.
Flag on Back Race
In this challenge, players have a flag on their back and race around a track after each other. When a player catches up to another player, they may take their flag. Once a flag is taken from you, you are out of the race. This challenge resulted in a contraversial calling trhe first year and resulted in numerous slight injuries due to running around a tree.