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Yajilin isn't on PuzzlePicnic, although I suspect it could be implemented easily. Yajilin consists of a grid in which some cells contain numbered arrows; you must shade in some cells such that every number represents how many shaded cells are in the row or column that the arrow points at. You cannot, however, shade in cells with arrows, nor can you shade in two cells which share an edge. In addition, you must draw a loop of horizontal and vertical line segments that passes through every cell that isn't shaded and that doesn't contain an arrow. Here is a 7x7 sample puzzle and its solution.

Here is a 31x45 Yajilin puzzle (referred to as Straight and Arrow on my blog). If you'd prefer to start with a small puzzle, this fairly easy one is just 10x10. Here is a 10x18 puzzle where the only number in the whole puzzle is the number 1. I hope you enjoy these puzzles!

You're not going to believe this, but... I actually solved it! And I can even prove it.

Fun puzzle, with enough different types of logic to keep it interesting. Not recommended for people in a hurry though...

Good job, Maarten! I'm glad you enjoyed it, and thanks for the feedback.