The independent Scotland-based developer, which is currently working on original MMOG All Points Bulletin (APB), said that the investment will help it develop new creative properties and bring innovative online gaming experiences to market.
Investment firm Maverick Capital led the latest funding round with existing investor New Enterprise Associates and WPP.
"Securing funding of this size from partners that are leading the financial and marketing communications industries further affirms Realtime Worlds' position as one of the most creative, respected and successful game development companies in the world," said Realtime Worlds founder and CEO David Jones.
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"Since our founding, we have been fortunate to have some of the gaming industry's top creative talent crafting amazing, groundbreaking interactive entertainment products. With this new infusion of capital, Realtime Worlds is poised to deliver new original experiences to gamers around the globe and to push the boundaries of online gaming."