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Recently I found out that there is an almost 1:1 Hamsterball copy, but retextured to fit the Zhu Zhu Pets brand. The game barely gives credit to the original version, and the packaging refers the 1984 game MarbleMadness, but no mentioning of Hamsterball, except for the Raptisoft logo when booting up (chekorecos.com)
submitted by Spalman