Develop and design gameplay, mechanics, characters, and storylines for casual games. Create detailed documentation, including game design documents (GDD), character descriptions, levels, and game mechanics. Conduct market and competitor analysis to identify trends and audience needs. Collaborate with artists, programmers, and other team members to bring game ideas to life. Create tasks for the team, decompose game design documentation, and plan feature releases. Conduct testing and balancing of games to ensure high quality and player satisfaction. Participate in the development of marketing strategies and game presentations.