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Rules are simple. Empty the board by selecting N-sized rectangles containing N different digits! There is always a single solution.

Examples

A six digits 8 x 9  board (solved)

A sixteen digits 20 x 20 board (solved)

Features

• Fast puzzle generator and solver 
• All generated puzzles have unique solutions 
• More than 10 puzzle types
• Autosave last puzzle
• Show solution
• Print puzzles
• Share puzzles