Some enigmas for your X-mas holidays

Hey you, puzzle solver! Those enigmas are for you if you accept the challenge to solve them.

Some of them require obstinacy... So let's begin!

Enigma #1

Let's begin by the most difficult enigma this time and be sure, it is a very very difficult one !

You have to find the numerical values which correspond to the symbols, so that the addition becomes correct.

Enigma #2

Go from "START" the the "END" without going diagonally or going twice through the same "box". The total of your path has to be 54.

Enigma #3

In grid A you can see 4 circles. They are neither in the same row, nor in the same column. 

But 2 of them are in diagonal (look at the arrow).

Put those 4 circles in grid B, so that they are neither in the same colum, nor in the same row, nor in diagonal.

I needed to make the picture very big, otherwise it's difficult to see anything...Sorry about that.

Enigma #4

Draw a circle with a point in the center like in the picture below.

You are neither allowed to use a rubber nor to lift your pencil from the paper!!

This is a tricky enigma, and so you need to "think out of the box" (fashion expression these days that many bloggers or people use...too often?...^^)

Good luck! Enjoy!!

Merry X-mas for you guys, hope you will spend good times with your friends and family and also that Father X-mas will put many puzzles under the X-mas tree. I am sure you deserve them :-)