alchemy set 2. Puzzle 3

Any clue type throughout the set may appear only once. Normal 6x6 sudoku rules apply. Place the digits 1-6 once each in every row column and 2x3 box. Cells separated by a knight's move (in chess) cannot contain the same digit. Clues outside the grid indicate the digit which has to be placed in the Nth cell in the corresponding direction, where N is the digit placed in the first cell in that direction. Digits on a grey line must sum to the digits in the connected circles. Cells separated by an X sum to 10. Adjacent digits along a light orange line must alternate between low (12), medium (34) and high (56). Any group of three in a row must contain one of each entropy. The highlighted grey square is even. The highlighted circle is odd. The cell with the fortress (inequality signs pointing outwards) must be larger than the orthogonally connected cells.