The new addicting puzzle!

[alum]

No. they just can't be repeated in the row column or 3x3 box

ie.
456 789 123
123 456 789
567 891 234

789 123 456
234 567 891
678 912 345

891 234 567
345 678 912
912 345 678


Although as I am writing this they all do add up to 45 because the same digits are always used 9+8+7+6+5+4+3+2+1=45