Half a croissant, on a plate, with a sign in front of it saying '50c'
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marginal sums

use minor diagonal sums, in the margin, to infer 'possible' numbers on grid, solve grid.
 
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Sudoku with actual mathematics.
wjt, Sep 07 2020

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       So, a bit like kakuro?
pertinax, Sep 07 2020
  

       A bit, but because the sudoku is setting the uniqueness frame , the diagonals can have repeating numbers unlike kakuro's verticals and horizontals.*   

       * assuming my knowledge of both games is correct.
wjt, Sep 07 2020
  

       Actually, any continuous shape on the Sudoku grid could have a bold frame and sum. A Tetris -like Sudoku Kakuro hybrid.
wjt, Sep 07 2020
  
      
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