Try this test!

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Oh man.. I can't see the patterns at all.. My brain must be too rusty. :(

Oh dear math. I can't solve it. Must brush up on my math for the kids.

Wait. Whats the missing number? Does anyone have a working answer?

There are 2 acceptable answers, 10 & 12. Both have diff patterns.

12 :) It’s the same formula: 2+3-1 =4 and so on ...

Answer is 12. Diagonals add up the same

What's the answer? I got 12.

Easy. 2 mins can settle

Looks difficult.