Domino Solitaire

Domino Solitaire (DomiSol) is a puzzle where 28 dominoes are placed to form a rectangle but you do not see their bounds. Your goal is to find these bounds by grouping the domino halves into a correct domino set.

A logic challenge. Each game has at least one solution, the game field can be customized, your game time is not limited, you can save the game and continue at any time later.