Complex sentence: Playtests can be run "open", "closed", "beta", or otherwise, and are very common with computer games, board games and role-playing games, where they have become an established part of the quality control process.
Split into simpler sentences: Playtests can be run "open", "closed", "beta", or otherwise. Playtests are very common with computer games, board games and role-playing games, where they have become an established part of the quality control process.