void DropYPanels(int x)
{
for (var y = 0; y < mapY - 1; y++)
{
PanelController panel = panels[x, y];
if (panel != null)
{
continue;
}
// 空きスペースを詰める
for (var y2 = y + 1; y2 < mapY; y2++)
{
PanelController newPanel = panels[x, y2];
if (newPanel != null)
{
newPanel.ChangeNumberByDrop();
droppingPanelCount++;
ReplacePanelPosition(newPanel, x, y, x, y2);
break;
}
}
}
}