Flalls

A sorting puzzle where you redirect rather than move. Yellow balls must reach the yellow field and blue balls the blue one, passing through a gap in a bar that sits between them — and your only tool is clicking a Flall to reverse its direction. Because everything is in motion at once, the difficulty is in timing the reversals so two balls do not arrive at the gap together. A clean idea with one verb, which is usually the sign of a puzzle worth playing.