Picross DS review at 1-up.

"You hate math? Yeah, so do I. So that means we probably agree that Sudoku is an exercise in mind-numbing tedium at best and a blight upon mankind at worst. It's interesting for a little while, until you realize you're basically just arranging and rearranging the same nine-by-nine grid of one through nine, nine times apiece. Like me, you probably hate the way that stops being a game after a while and degenerates into mundane obsessive-compulsion.

Picross DS, though -- Picross is great! Really great. Which is weird, because it's a game about math. Well, sort of. It's not so much about fitting numbers into a grid as it is using numbers to create pictures in the grid. Picross -- that is, "picture crossword" -- includes a hundred or so different puzzles to solve."

Full Source: 1-up