Rules: Shade in two or more cells in each outlined area such that all of the shaded cells in each outlined area are edge-connected. All shapes must be connected diagonally. Shaded cell groups of the same size cannot touch across regions in any way, not even diagonally. Shaded cell groups of different sizes may only touch each other diagonally.
About: This puzzle type was invented by Anurag Sahay.
Rules: Divide the grid along the gridlines into some regions, and fill each of the empty cells with a number. When two cells containing the same number touch along an edge, they must belong to the same region. Given numbers represent the area of the region they belong to. A region may contain none, or one or more of the givens. Also, every region must be adjacent to a region of consecutive size.
Rules: Shade in some cells such that each outlined area contains four shaded cells that form a Tetromino. No 2×2 square can be shaded completely. All shapes must be connected to form a single contiguous group of shaded cells. Identical figures, regardless of rotation or reflection, cannot share an edge.
Rules: Place the complete set of seven tetrominoes (reflections included), such that they do not touch each other, not even diagonally. Given numbers at grid vertices indicate how many of the adjoining cells are occupied by tetrominoes. You can rotate the tetrominoes, but not mirror them.
About: This puzzle type was invented by Serkan Yurekli