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Shikaku

Divide the grid into rectangles so each contains exactly one number equal to its area.

Shikaku gameplay

How to Play

The grid contains numbered clues. Your goal is to partition the entire grid into non-overlapping rectangles where each rectangle contains exactly one clue and the clue's value equals the rectangle's area.

  1. Navigate to a numbered clue and press Enter or Space to select it.
  2. Press arrow keys to expand the rectangle in each direction.
  3. Press Shift+Arrow to shrink a side if you overshot.
  4. Press Enter or Space to confirm when the preview is green.
  5. Press Backspace to cancel a draft or delete a placed rectangle.

Controls

Navigation Mode

Key Action
Arrow keys / WASD / hjkl Move cursor
Enter / Space Select clue for expansion
Backspace Cancel preview or delete rectangle at cursor
Ctrl+R Reset puzzle
Ctrl+H Toggle full help
Escape Return to main menu

Expansion Mode (after selecting a clue)

Key Action
Arrow keys / WASD / hjkl Expand rectangle in that direction
Shift+Arrow / WASD / HJKL Shrink rectangle from that side
Enter / Space Confirm placement (green preview only)
Backspace Cancel, discard preview

Modes

Mode Grid Max Rect Description
Mini 5x5 5x5 5 Gentle introduction
Easy 7x7 7x7 8 Straightforward puzzles
Medium 8x8 8x8 12 Moderate challenge
Hard 10x10 10x10 15 Requires careful planning
Expert 12x12 12x12 20 Maximum challenge

Quick Start

puzzletea new shikaku mini-5x5
puzzletea new shikaku easy-7x7
puzzletea new shikaku hard-10x10