I am working on this puzzle since last week.
01 ?? 05 12 10 13 15 09 14 02 08 03 04 07 11 06
which is the missing number ??
note : answer is not 16
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A valid answer is
The existing numbers in the 4x4 matrix range from 1 through 15. From my perspective, there seem to be no logical coherence in their placement. Hence the remaining possible number in the sequence is either one more than the last number,
16, or one less than the first number
00. As 16 is ruled out in the question, 00 is the remaining option.
Credits to @SayedMohdAli for discussing this in the comments.