WildTangent, the Redmond, WA-based online gaming service and ad network, has received another big round of $20 million, this time in venture debt financing. The round was led by Hercules Technology Growth Capital. The financing follows a $13 million venture round last year, which included participation from WPP, Granite Global Ventures, Greylock, Madrona Venture Group and others. The company has now raised a total of $100 million till date, since being founded in 1998.

WildTangent CEO and co-founder Alex St. John came from Microsoft, (NSDQ: MSFT) where he was one of the creators of the DirectX technology. SeattlePI: WildTangent, which distributes about 450 online games, inked a deal in October to expand a relationship with HP in which it runs the game platform on new computers. It also provides games to Dell, Toshiba and Gateway. More in the PDF release.

• Game Publisher/Ad Network WildTangent New $13 Million Round Includes $3 Million Firm From Sorrell’s