Count the colors, then take away the ones that are not suits.
Before you touch a tile, you say how many suits the line takes. Then you build it.
Counting the colors is not the same as counting the suits. A flower is printed in a color and belongs to no suit at all. So are the winds.
The lines start small and grow. Tap a group, then tap tiles. Tap a tile in your hand to send it back.
No clock. A wrong answer costs you nothing.