Honolulu-based Tetris Online Inc. has laid off 20 of its 50 employees, a company spokesman said Monday.

Employees included in the layoffs were part of the company’s production team working on Facebook games, said Casey Pelkey Tetris Online vice president for marketing. There also were layoffs in customer service, quality assurance, art, and product development, Pelkey said in an email. The layoffs were effective Feb. 15.

Dean Hirata, Tetris Online chief financial officer, felt the company could achieve its business goals with a smaller team and greater efficiency, Pelkey said.

Founded in 2006 by Minoru Arakawa and Henk Rogers, Tetris Online has the exclusive rights to market the Tetris game in North America and Europe. Tetris Online also is the developer of Tetris Party for WiiWare, Tetris Splash for Xbox Live Arcade, and Tetris Friends Online Games.