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It was the first in the series to use Valve 's Steamworks DRM and achievements system , thereby requiring Steam to be played .
 organization: Valve
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Valve 
Answer:
 organization: Valve