This index is for the single element in a game that stands out against all others as the single source of all player frustration.

Tropes in this index do ''not'' merely list frustrating elements in games: that's why it's "That '''ONE''' Index".
* ScrappyMechanic
* ThatOneAchievement
* ThatOneAttack
* ThatOneBoss
* ThatOneCase
* ThatOneDisadvantage
* ThatOneLevel
* ThatOnePlayer
* ThatOnePuzzle
* ThatOneRule
* ThatOneSidequest