Судоку-аргайл №299968

Thanks for adding argyle. I had never heard of it. loved playing it.

However, that additional slanted lines are not visible on the screen, and without that it become difficult to solve. We don't know nor remember where the lines should be.

So please add to display those additional slanted lines on the screen, as additional boxes are shown in Windowkus by dashed lines.

Thanks.