Oskar's Harbour Puzzle: M. Oskar van Deventer
5 January 2002 (Original design: 16-11-1989)

Object: Move all containers plus cranes from the quay onto the ship

Rule 1: A crane can only move itself and things below it (including other cranes)
Rule 2: For stability, there can never be empty space below a crane.

Operation: Click a crane and move it using the arrow keys.
(alternatively, move selected crane by clicking an empty target position.)

[Linguistic note: harbour is English for harbor.]