You Must Escape 2 Level 11 Guide:
Place both lens onto the glasses and use them on the TV (turn on TV with remote, make sure it's plugged in too).
You'll get the code 3507.
Use the code 3507 to open the safe behind the painting.
Look at the paper and add the numbers to get the code 3889.
Use the code 3889 to open the bottom drawer on the desk. Take the knife.
Use the knife to remove the bottom of the shoe (next to door) and you'll find the keycard.
Proceed to the next You Must Escape 2 level!
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