Harbour

row the boats out in the order the line needs.

a packed rainy harbour: tap a boat whose way is clear and the umbrellas of its colour hop in

A boat can only row out the way its bow points, and only if nothing is in front of it. It goes to a free berth, and the people at the front of the line board boats of their own umbrella colour. A boat parked for riders far back in the line keeps its berth, and when every berth holds the wrong colour the quay jams. Read the next few umbrellas before you tap.

Concepts: queues, planning.

An interactive you play with one thumb, on Wundr.