[Rules]
· Divide blank cells into 2-4 strips.
· Numbers means how many strips touch the number.
· "○" means directions of strips in these two cells are same,
and "✕" means directions are different.
[Example]
[Operations]
· Click no-number cells to change lines:
"1 vertical" → "2 vertical" → "3 vertical" → "(no lines)"
→"1 horizontal" → "2 horizontal" → "3 horizontal" → "(no lines)"
· Green thin lines mean that they are assumed ones.
Red thick lines mean you fixed them.
You can switch which color you use with radio buttons on the right.
· If you want to switch green lines to red,
you only have to check "Fixed" radio button and click green lines.
You have to turn all lines to red before you check your answer.
· Click "Check your answer!" button and if it's OK,
you can go on to next problem.