Diablo III PC gaming is big again. According to market research firm NPD, the release of Diablo III drove PC game sales up 230 percent in May. That was in a month where overall sales of games dropped by 28 percent. The Gods and Kings expansion to Sid Meier’s Civilization V did well in its recent release, too. Even smaller companies, such as Ironclad Games, with its Sins of a Solar Empire: Rebellion, are shipping PC games that garner great reviews and attract new players.