35881
Once their pet has been customized , players can navigate their way around Monstro City , take daily puzzle challenges to earn ‘ Rox ’ ( virtual currency ) ; play games ; personalize their room and communicate with friends in a safe environment .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None