This game is not at all difficult. It took perhaps five minutes. Write down the decoder it gives you, and the six-digit number. Decode that number. Save it for later. Input the number from the front of the box by clicking on the numbered buttons. When the entry box opens, input the date from the bottom of the box exactly as it's printed. That reveals another input box, into which you enter the -decoded- six-digit number. That's it.
 "The Contraption"){kind=icon}
 "the great living room escape"){kind=icon}
 "The Great Kitchen Escape"){kind=icon}