Logic Masters Deutschland e.V.

A continuation of my previous puzzle link(6*6). I am enjoying these small grids a lot. Hope you will like solving them as well. Happy solving!!

There are total four puzzles in this set.
Rules:

Puzzle 1:

Normal 4*4 Sudoku rules apply.

The two digit number in cage 'a' (r1c1 is the tens digit) is divisible by the two digit number in cage 'b' (r4c3 is the tens digit). The two digit number in cage 'b' is divisible by the number in cage 'c'. Finally the number in cage 'c' is divisible by the number in cage 'd'.

Puzzle 2:

Normal 4*4 Sudoku rules apply. Cells separated by a chess knight move don’t have repeated digits.

The two digit number in cage 'p', the two digit number in cage 'q', and the number in cage 'r', are prime numbers

Puzzle 3:

Normal 4*4 Sudoku rules apply.

The digits in the line must be in-between the digits in the circles.

The clues outside the grid give the parity of the sums of the digits along the indicated diagonals. 'O' for odd and 'E' for even.

Puzzle 4:

Normal 4*4 Sudoku rules apply. Cells separated by a chess knight move don’t have repeated digits.

The clues outside the grid give the sums of the digits along the indicated diagonals. Digits may repeat in these sums. The value of 'x' needs to be determined by the solver.

f-puzzle link:

I do not able to draw all the puzzle properly in f puzzle. Please check the image given here for any ambiguity.

f-puzzle (Puzzle1)

f-puzzle (Puzzle2)

f-puzzle (Puzzle3)

f-puzzle (Puzzle4)