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This was recently released. The following content and information on this page may contain major spoilers for those who have yet to play it. Caution is advised.
Surgeon Simulator: Anniversary Edition is a DLC for the Steam and PS4 versions of Surgeon Simulator 2013, it was released on PS4 on August 12th, 2014 and released for PC August 14th for $2.99 in the US and most other regional currencies and £1.99 in the UK, unlike the previous smaller free updates/DLC and celebrates the one year anniversary of Surgeon Simulator's release.
There are several new operations, bringing up the total to 20, including the previously tablet exclusive teeth and eyeball transplants, the new Corridor Operations as well as new achievements (the previous amount of achievements before the DLC was announced was 72, and after the update the total is 114, so there are 42 new achievements).