Ripple Effect

A logic puzzle where you fill numbered rooms while respecting the ripple constraint.

Rules

1. Room Constraint: Each room (region) must contain all consecutive integers from 1 to N, where N is the number of cells in that room.

2. Ripple Constraint: If the same number N appears twice in the same row or column, there must be at least N cells between them.

Example

In a row: 2 _ _ 2 is valid (2 cells between the 2s) In a row: 2 _ 2 is invalid (only 1 cell between the 2s)

How to Play

• Click on an empty cell to select it
• Use the number pad or keyboard (1-9) to enter a number
• Press Backspace/Delete or click ✕ to clear a cell
• Use arrow keys to navigate between cells
• Toggle "Show errors" to see constraint violations

Dataset

Puzzles are pre-generated offline using a solver that verifies unique solvability.

• 6×6 grids: Easy, Medium, Hard
• 8×8 grids (standard): Easy, Medium, Hard
• 10×10 grids: Easy, Medium, Hard

Implementation Notes

• Puzzle generation uses backtracking with constraint propagation
• Room layouts are randomly generated polyominoes
• Each puzzle is verified to have exactly one solution
• Seeds are deterministic for reproducibility