Rules
200
To get 200, the digits in the left hand column have to add up to 9 and the digits in the right hand column have to add up to 10 and the diagonal column from bottom left to top right have to be the same.
100
To get 100, the digits in the left hand column have to add up to 4 and the digits in the right hand column have to add up to 10 and the diagonal column from bottom left to top right have to be the same.
150
To get 150, the digits in the left hand column have to add up to 5 and the digits in the right hand column have to add up to 7 and the diagonal column from bottom left to top right have to be the same.
300
To get 300, the digits in the left hand column have to add up to 14 and the digits in the right hand column have to add up to 10 and the diagonal column from bottom left to top right have to be the same.
Even
You have to get all the numbers even, all the numbers are odd, if every number apart from the top left, which has to be odd, is even you will always get and even number. And every number apart from the number in the top left, which has to be even, is odd.
Why - Because if you add all even numbers together you will always get and even number, if you add all odd numbers you will always get an even number.