And Neutralise The Isotope Quickly Until Entirely Safe”

There has been another radio-isotope disaster on the remote planet of Gondwana! A heavy subterranean gas has leaked into the museum and threatens to destroy priceless antiques.  The objective is to transfer a spherical object (a tennis ball) from a “start zone”, through an open “window” to a stationary position as close as possible to a defined elevated point.