2K Czech a.s. (previously known as Illusion Softworks) is a game development company located in Brno, Czech Republic. The company focuses mostly on first-person and third-person shooter games, but is widely known for their Mafia series of video games. Since the foundation in 1997, till the sale to Kush Games (a subsidiary of Take-Two Interactive) ten years later, its owners and key managers were founders Petr Vochozka and Jan Kudera.

In September 2008, the company was renamed 2K Czech