33621
You may of done maths, but you didn't follow the rules of the maths game
All digits (excluding the last digit) must be used to equal the last digit, not the last digit and some other digit. All digits must be separate (no 2 digit numbers) and you cannot add or remove digits.
Therefore
3 + 3 - 6 = 2*0 would not be valid maths game operation, but
(3 + 3 - 6)*2 = 0 Would be
For example
(3/3)6 + 2 = 1