Let me restate the rules:
* All 26 letters of the alphabet have been used exactly once;
* two letters which are consecutive in the alphabet are always adjacent either horizontally, vertically or diagonally. Hence the alphabet forms a kind of snake throughout the firgure;
* The letter A does not need to be adjacent to the letter Z;
* A letter in the margin is present in the same row (if margin letter is adjacent to a row), in the same column (if the margin letter is on top or bottom of a column) or in the same diagonal (if the mnargin letter is in one of the corners);

Letterboggle (1)^*

Letterboggle (2)^*

Letterboggle (3)^**

Note that not all border fields contain a clue. This is on purpose.
Personally I would find alphabet snake a better name, but

You can check your solution here, here and here.