1. The clue in this level is the "A=01".
From this, you can guess that B=02, C=03, and so on.
Looking at the numbers on the door, decode each set of numbers. Also notice the four different colored hearts on the door.
25 = Y = Yellow
07 = G = Green
18 = R = Red
02 = B = Blue
250725180207 = YGYRBG
Press the colored hearts in this order:
Yellow green yellow red blue green
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2. Proceed to the next level!