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During mid-2011 , Valve began to offer free-to-play games , such as " Global Agenda " , " Spiral Knights " and " Champions Online " ; this offer was linked to the company 's move to make " Team Fortress 2 " a free-to-play title .
 organization: Valve
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 organization: Valve