I believe I have invented a new type of puzzle...
What is its name?
Colour-blind-friendly version available here.
Begin by solving the 9x9 sudoku; each of the 9 symbols
< must appear exactly once in each row, column and thick-bordered 3x3 box. Then apply some grid-deduction-deduction (!) and discover its name!
Every colour used in this puzzle is there to help you solve it, whether for deriving and solving the second-stage grid-deduction puzzle or deriving its name. Every colour...
sudoku then grid-deduction then arithmetic
Other puzzles in the 'This new puzzle type needs a name' theme: 01, 02, 03, 04