Find all the dominoes within the grid.
Each domino is either horizontally or vertically aligned.

Each of the O symbols suggest that the two adjacent dominoes are aligned in the same direction.
X's suggest the two adjacent dominoes are aligned at 90 degrees.

You can Print out a sheet's full, here, or Play it in your browser, here.

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What I Didn't Do

... Organise my day!

This was a rapidly coded panic game, but I think it still works well enough.