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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.
Java Zoop
Online Java implementation of Zoop, without instructions.
Underdogs: Zoop
Review, game information, music sample, DOS version download, links to related games.
Wikipedia: Zoop
Encyclopedia article on Zoop.