Shikaku Grove

Shikaku Grove is a quiet web site built around one puzzle type: Shikaku. A Shikaku grid holds scattered numbers, and your job is to cut the whole grid into rectangles so that each rectangle contains exactly one number and covers that many cells. Squares count as rectangles, and no cell may be left out or shared.

Every day at 00:00 UTC the site posts a new daily set in three sizes, labelled Gentle (5x5), Steady (7x7) and Deep (9x9). Everyone gets the same grids for that date, and the site says its puzzles are generated in house and checked to have a single solution. A board you already have open stays on its date until you refresh, and Copy puzzle link shares the exact date and size you played.

You draw a rectangle by tapping two opposite corners or dragging across the grid, and the whole game can also be played from the keyboard. A timer runs while you work, a counter shows how many rectangles you have placed, and Undo and Erase take moves back. Explain a step gives a nudge that names the next rectangle to place and why, which suits players still learning the logic. When you finish you can copy your result to share it.

Beside the daily set there is a Practice page that makes extra puzzles in the same three sizes, a puzzle library, a How to play page with a small worked example, a strategies page and a printable sheet of three grids with answers. The site says its grids are made in house and checked by a solver for one solution reached by deduction, and that it runs without advertising. It suits anyone who likes short deduction with little arithmetic: counting cells and multiplying two sides is all it asks.