You'll need a QR Code Reader. 

Good news - many apps are free. 

OR, some phones will read these QR codes through the camera viewer.  Put the image in the middle of the field of the camera and a website might pop up in a blue bar above the image (this works with 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