You'll need a QR Code Reader. 
Good news: many apps are free or use your phone's camera viewer. 
  Put the image in the middle of the camera's field of view, and a website might pop up in a blue bar above the image (this works on iPhones). 
Click on the website, and it takes you where you need to go at yourmysteryparty.com/ 
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If this doesn't work for you - you'll need a
QR reader app, if nobody has one. 
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Or........
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You can just go here: 
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CLICK HERE