Zoltan’s Revenge, also called Shadow Keen 4, is a Keen 4 mod by Levellass. A demo was first released for Andrew Durdin’s Keen 4 Mini Mod contest, in which it won first place. A second demo was released on August 23, 2009. The final, complete version was released in 2012. Play Commander Keen: Zoltan’s Revenge online!
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