Rectangles turns a clue grid into a partition puzzle. Drag from one cell to another to outline a rectangle; the overlay shows its area as you drag. Release to keep a rectangle only if it is legal: no overlap with existing regions, at most one numbered clue inside, and an area that matches that clue when a number is present. Tap a drawn rectangle to remove it.
The board is complete when every cell belongs to exactly one rectangle and every numbered clue equals its region's area. Rectangles may touch along edges but cannot share cells. Clueless cells still need coverage even though they carry no number.
Worked example
On a six-by-six board, a clue of 6 in the top-left corner might be a one-by-six bar or a two-by-three block. Look at neighbouring clues: if the cell directly below also holds 6, a tall skinny rectangle for the top clue would consume the lower clue's space. A two-by-three anchored at the corner leaves room to test separate shapes below.
Strategy tips
Large clues first. A clue of 12 on a 4×4 board must be the whole grid; a clue of 8 on an eight-wide board often forces a two-by-four or four-by-two shape once you see where other numbers sit.
Watch unused area. If remaining free cells sum to exactly one rectangle's worth for a remaining clue, draw that region before experimenting elsewhere.
Remove boldly. Illegal rectangles simply do not stick on release. When an outline feels cramped, erase it and try an orientation that keeps clues in separate compartments.
Hint narrates one logical step. Undo, Restart, and the puzzle picker help you move through the level set at your own pace.
When several small clues sit near each other, try whether they belong in one combined rectangle or in separate compartments separated by a one-cell wall. A quick sketch in your head before dragging often saves an illegal overlap that would not stick anyway.