Logic Masters Deutschland e.V.

It is Scojo's birthday! 🥳
Here's a copycat puzzle to celebrate.

• Normal sudoku rules apply.
• Copycat Cells:
  • Place nine copycat cells on the grid so there's exactly one copycat cell in each row, column and box.
  • Digits may not repeat in copycat cells.
  • The value of a copycat cell is equal to the digit in the cell that is a 180° rotation around the the center of the grid (for example, if r7c9 is a copycat cell, then its value is the digit in r3c1).
  • The value of a non-copycat cell is equal to the digit in it.
• Full Quad-Rank:
  • All the 2x2 areas of the grid, when their values are read in western reading order, make a total of 64 four-digit numbers.
  • Clues in the center of a 2x2 area show its rank among those 64 numbers, where the lowest is 1 and the highest is 64.
  • One or more equal numbers are considered to be at rank N when there are N-1 numbers of strictly lower rank. (For example, we say there are three numbers in rank 20 when there are 19 numbers of lower rank and the next rank will be 23, i.e. the ranks could go ⋯, 19, 20, 20, 20, 23, ⋯)

Online in Sudokupad

See also:

• a gentle dissolve
• Cuauhtémoc with MathGuy_12 and ChinStrap
• fragmental ablation
• Dutch Flat Mates (Full Quad Rank)
• who wants seconds?