Indiana Jones and the Great Circle's side quests are so seamlessly integrated into the story that it's hard to tell whether they're actually optional.

Indiana Jones and the Great Circle didn't make it through the development process unscathed, with one location ultimately cut from the final game.

Indiana Jones and the Great Circle has a massive number of side quests and mysteries to uncover, including the mysterious locked door in the middle of the jungle in Sukhothai. This door is a part of the Jungle Bruiser Pit discovery quest, which will reward the player with two new adventure books and a healthy amount of cash upon completion.