SAN FRANCISCO, August 29, 2019-- Knock Knock, a developer of frictionless games and technologies for a post-App Store world, announced today it closed $4 million in Series A financing, bringing total funding to $6 million since June of 2018. March Capital Partners led the round with participation from existing investors, including London Venture Partners, Raine Ventures, and Ludlow Ventures. Gregory Milken, Managing Director at March Capital Partners, is also joining the board, bringing his deep gaming and consumer internet expertise to Knock Knock.