Creek is a pure-logic grid puzzle in the Nikoli tradition. Your goal is to shade (blacken) cells of a rectangular grid so that two conditions hold: every numbered clue is satisfied, and all unshaded (white) cells remain a single connected group. Clues are placed at the intersection points between cells — the corner shared by up to four cells — and each number states exactly how many of those neighboring cells must be black.
Tap a cell to cycle it through empty, black, and white. Use the intersection clues to deduce which cells must be shaded. A clue of 4 means all four neighbors are black; a clue of 0 means none are. Remember the connectivity rule: white cells can never be split into separate islands. Work through 27 progressively harder puzzles from gentle 5×5 grids up to challenging 9×9 master boards.