froggy sort 與 PatariDori 使用情況與統計

It is a game that turn all panels upside down with one-stroke-drawing. Make one-stroke-drawing that the lines do not intersect on the panel. Go through the panels in numerical order. "Migratory Bird" is “Watari Dori” in Japanese. If succeed in writing with one-stroke, finished and proceed to the next stage. The level goes up depending on the speed of clearing. As the level goes up, the numbers increases and the stage becomes more complicated.