On the board find and mark all dices of domino. Each dice can appear only once on the board.
#
Online solving.
If you click on two adjacent pieces, you will mark the dice of domino. In the beginning the first marked field will be shown in red colour.
When you click second field, the dice of domino will be created.
In order to put a separating line between adjacent pieces, click that line. If you click again, you will unmark that line.
In case of marked dice, cancellation of step can be possible through the unmarking of each lines.
You can also use the option "Start again" from Helper.
Domino