The PC game market rise, fall, and rise again in recent years due to digital platforms reshaping the industry’s landscape. This thesis aims to have a deeper understanding of this digital platform transformation of PC games and develop digital platform strategies for vendors to follow suit. The thesis first develops a general three-stage model for digital platforms based on the dominant industrial leader, Steam, and then compares this model with four major followers in this market to derive general and specific digital platform strategies for vendors to develop their unique competitive advantages based on their market positions. The thesis concludes with a set of implications for PC game vendors to transform their traditional standalone business into a digital platform.