Zoop

Java Zoop
Online Java implementation of Zoop, without instructions.
http://joel.spolsky.com/zoop/

Wikipedia: Zoop
Encyclopedia article on Zoop.
http://en.wikipedia.org/wiki/Zoop

GameSpot
Rated 7.0/10 by Ron Dulin. "Once you do break through the initial frustration, Zoop will gradually become an addiction." Reader reviews. 5 screen shots. <small>(May 1, 1996)</small>
http://www.gamespot.com/pc/puzzle/zoop/