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It’s a hero sandwich of a puzzle. It’s a Sudoku. And an anagram. And as a puzzling bonus, one of the critical clues has been left out as an exercise for the solver. And there’s another very misleading clue about swords in the subtitle.

This month we present another Sudoku puzzle with a bonus anagram. Simply fill in the empty cells with the nine unique letters you’ll find the the grid in such a way that each row, column, and small square contains each of the nine letters exactly once.

Once you finish it, rearrage those nine letters in an order that doesn’t appear in the grid to reveal the name of a computing legend.

Oh, there's one difficulty. As you can see, one of the nine letters doesn’t appear anywhere in the puzzle grid. You’ll have to figure out what it is and where it goes yourself. Good luck!

The missing letter is: _ . And the computing legend is: _ _ _ _ _ _ _ _ _ .

The subtitle is a clue, if you focus on its swords. Solution right here next issue. Or on Twitter right now, no doubt.