Puzzle 11: Masyu
Of course, I had to be a bit cheeky and include letters in my design as if to say "Yeah, I know we're not allowed to use letters...anything you see must be your mind forming things that aren't there!" The GL stands for "Grey Labyrinth."
Rules of Masyu (stolen from nikoli.com)
Make a single loop with lines passing through the centers of cells, horizontally or vertically. The loop never crosses itself, branches off, or goes through the same cell twice.
Lines must pass through all cells with black and white circles.
Lines passing through white circles must pass straight through its cell, and make a right-angled turn in the cell next to the white circle (left or right).
Lines passing through black circles must make a right-angled turn in its cell, then it must go straight through the next cell (till the middle of the second cell) on both sides.