Central Symmetry
Rules:
- Classic Sudoku:
Every row, column and 3x3 box must contain every number from 1 to 9.
- Entropic Lines:
Every sequential group of 3 cells on a line must have a low digit {1,2,3}, a medium digit {4,5,6}, and a high digit {7,8,9}.
- Arrows:
Numbers along an arrow sum up to the total in the circled cells; the circled value is read left to right or top to down if composed by multiple digits.
- Greater/Less:
If two digits are separated by a “<”, the smaller one in on the side where the “<” points to.
- Even:
A digit inside a grey square must be even.
Play it online in SudokuPad.
This puzzle is also on Logic Masters Germany.