This is a list of content that was either removed or altered in the final version of Sly Cooper: Thieves in Time.
- The green gem and Classic Gaming Gear were a piece of loot and treasure respectively, originally supposed to appear in Japan. The former was replaced by the kabuki mask in the released game.
- Ancient Egypt was initially going to be included as the first episode, but was cut because of the size limits of PS Vita games. However, it was incorporated into a secret ending for the game, showing Sly in the sand next to a sphinx and two pyramids.
- The episode has a completed script and was intended to be developed and released as post-launch DLC for Thieves in Time, but this did not occur for unknown reasons.
- Horseshoe Mode was going to be a sort of "New Game+" mode. After completing the game once, it could be played again without a health bar, instead going to back to Sly Cooper and the Thievius Raccoonus style of gameplay, using horseshoes as health. It was removed because of time constraints.
- There were three planned antagonists not present in the released game:
- A male elephant who was meant to be the antagonist of 40 Thieves. He was later merged with another character to create Miss Decibel. Aspects of this character remain in the final game, such as elephant statues holding books in their trunks and acting as fountains.
- A female monitor lizard who appeared to be some sort of wealthy aristocrat. Her planned role in the game is unknown, but her character was later merged with the male elephant to create Miss Decibel.
- A male mole with a large drill-like contraption strapped to his back. He was the original antagonist in "Of Mice and Mechs" instead of Penelope.
- Back when the arefore mentioned mole was the main antagonist of "Of Mice and Mechs", Penelope was supposed to be a protagonist.
- Sir Galleth's domino mask was originally black instead of blue.
- "Of Mice and Mechs" was originally going to be called "Holy Grail Robin".
- Bob was originally meant to be afraid of Bentley's gadgets, but this was changed in the final version.
- Early footage shows that when Rioichi was preparing to use the Leaping Dragon technique, he was able to turn invisible. In the final product, Rioichi never turns invisible while using this move.
- Grizz was originally supposed to be voiced by Biz Markie, who had done demo readings in pre-productios. Instead, Sanzaru chose as the voice of Grizz for the game.
- Grizz was originally going to be named Grizzle B.
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