How many Jedi survived Order 66? Was Master Yoda the only one or are there any more who disappeared into the shadows?
The Force Unleashed is not strict canon, but it does indicate that a number of Jedi survived the order, as your character is required to hunt down a number of Jedi hiding in various locations.
Various semi-canonical sources (novels, etc) indicate that
- some Jedi survived the purges
- Not all force users were Jedi nor Sith
- Not all Jedi were targeted
We see Mara Jade and at least one other dark apprentice in the novels, plus at least two non-Jedi, non-Sith force users in the Heir to the Empire trilogy.
It's probably safe to say that Obi Wan and Yoda are the last of the Council's Jedi Masters; various failed apprentices and former Jedi seem to be out there as well, EG Count Duku. (Dark Empires, Eps II & III) Rebels shows us a couple other Jedi Knights also survived.
Plus, there are implications that there were other Jedi temples with training centers, and that not all might have been found.
I know that Ferus Olin survived and goes through a story in the Last of the Jedi series by Scholastic, where he rescues two other Jedi and starts a Jedi rescue base on an asteroid.
Some clones didn't follow Order 66 and those Jedi escaped, as did the ones who were almost killed like Yoda or Kenobi.