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The game was originally created with the name "Distrust", and was originally designed to be far darker and sinister than that of the final release.
Contributed by Thewelshyoshi
Although the executions for Spoiler:Sayaka, Kiyotaka, Yasuhiro, Byakuya, Chihiro, Touko, Aoi, Sakura, and Spoiler:Hifumi were never seen in the game, each character did have their own personal executions designed for them, which can be found in the Official Danganronpa Art Book.
Contributed by SOGESNAKE
In the Vita version of the game, the trophies "Despair's Last Reward", and "Nine Coins, Nine Purses, Nine Bears" are references to the Zero Escape series, which was also developed by Spike Chunsoft. More specifically, the games Virtue's Last Reward and Nine Hours, Nine Persons, Nine Doors.
Contributed by SOGESNAKE