Game developers come up with ideas for new games through a variety of ways, including:

1. Personal experiences and interests: Drawing from their own lives, hobbies, and passions.

2. Market trends and research: Identifying popular genres, mechanics, and themes.

3. Brainstorming sessions: Collaborative discussions with team members to generate ideas.

4. Inspiration from other media: Books, movies, TV shows, comics, and other games.

5. Player feedback and community engagement: Listening to fans and incorporating their suggestions.

6. Experimentation and prototyping: Creating rough prototypes to test and refine ideas.

7. Industry events and conferences: Attending gaming conventions, workshops, and seminars.

8. Social and cultural observations: Exploring current events, social issues, and cultural phenomena.

9. Classic games and retro inspiration: Drawing from timeless gameplay mechanics and nostalgic themes.

10. Dreams and imagination: Letting creativity flow and exploring new, innovative concepts.

Game developers often combine these sources, mixing and matching elements to create something unique and exciting. The idea generation process can be spontaneous, iterative, and ongoing, with developers continually refining and building upon their ideas.