Combine the knife and the chalk and use it on the mirror in the bottom right. Then examine the code that appear on the mirror. You will get a code. Each number of the code tells you which order and which side of the dice you have to look at. Ex. 6614, 1st, 2nd, 3rd, 4th number position for the safe. 6 for the 6 dotted side of the dice, 1 for the 1 dot on the dice, and so on. Then use the code on the desk to help you find out the numbers.
If you examine the desk, you will see which represents what.
The circle that looks like a fingerprint, is for a black dot on the dice, which is 1.
A white circle which represents 2. (it says x2, it does not mean "times 2" or "the letter X,2"
A white circle with another white circle inside, which is 3.
A White circle with a black dot on the inside which is 4.
Use this code and the code on the mirror to find which side to look at and how many dots there are. Count up the dots on the side according to the code to find out the number.
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Example: 6614 HERE AND BELOW IS ONLY A EXAMPLE NOT THE ACTUALLY ANSWER.
Look at side 4 of the die, there are 5 black dots, and one white dot. 1 black dot = 1, 1 white dot = 2. Therefore 5 + 2 = 7.
Look at side 1, there is only 1 white dot with a white circle. White dot with white circle = 3. Therefore it is 3.
Look at side 4 of the die, there are 3 black dots, and one white dot with a white circle.
Using the code, a black dot is 1 and a white dot with a white circle is 3. Therefore, 3+3= 6.
Put these all together it is 7736.
Not sure the code on the mirror generates randomly or by version.