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Curious Cheetah

Dominoes

Background

This puzzle appears to be fairly old, appearing as early as 1874. Richard Osa patented it in Germany in 1893 (hence the name "Dominosa").

Puzzle and Goal

An unsolved puzzle consists of a rectangular grid filled with numbers or pip clusters.
The goal is to create regions to satisfy the grid.

Rules

The solved grid must satisfy the following conditions:

Other Names

Dominosa

Playable Online