Endorain 端線
Endorain is the Japanese logic puzzle also known as End Line. The board is divided into coloured regions. Draw straight horizontal and vertical lines between the centres of cells until every cell belongs to exactly one line — lines never cross and never overlap. Each line's two ends must lie in two different regions; whatever it passes through on the way doesn't matter. The number in a region says how many line-ends that region holds, so a 0 means no line may end there.
Three modes: Classic, Reach — where every line must span at least three cells, so no line can simply hop over the nearest border — and Once, where any two regions may be joined at most once.
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