Has anyone seen these puzzles? You have a grid scattered with trees in some cells. To the side of, and adjacent to, each tree is a tent. No tent can be adjacent to another tent, not even diagonally, although they can be adjacent to trees other than their own. At least some rows and columns typically have numbers outside them, indicating the number of tents in that row or column. I've seen them a few places including GAMES Magazine. It took me a while to figure them out but then I learned the "tricks."