Objective: Fill the grid so connected regions of same numbers have area equal to that number.
Controls: Select a number from the toolbar, click cells to place. Click placed cells to clear. Given clues are fixed.
Rules: Same number orthogonally adjacent cells form a region. Region size = number value. Regions with same number cannot touch.
Fill a grid with number groups where each group contains the number of cells equal to its value. Adjacent same numbers form groups. Number puzzle with regional constraints.