Buy Surgeon Simulator on Steam, currently for $10 USD (both VR and non-VR versions included):
http://store.steampowered.com/app/233720
Here is my hacked DLL which enables you to use the Oculus Rift support at resolutions other than 1280x800:
https://drive.google.com/file/d/0B51t...
Place it at "C:\Program Files (x86)\Steam\SteamApps\common\Surgeon Simulator 2013\ss2013_Data\Managed", but back up your old DLL first!
Resolution note: The video is recorded at 1920x1200 and cropped to 1920x1080, but inside the Rift Dev Kit I see the image at only 1280x800.
Title music: Eric Steuer - "Bust That Rap Like Nobody's Listenin' (Dare 2 B Great remix)" / CC-BY