Simply fill the X with the numbers 1 through 9, so that all the totals add up correctly.

You can Print a page full of Nine X here, or alternatively Play in your browser!

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What I Didn't Do

Spike!!
I almost did, but I figured having to fill in the numbers 1-24 might be a teensy bit more tricky.
I might do that at a later point, though, if I completely run out of ideas!

You can Print a page full of Nine X here, or alternatively Play in your browser!