How do you make game code work for different game genres?

Use BreakDown As were the game Engines made by looking at common features all the games need like physics systems , particle systems , input system etc. Breakdown your game into 2 Categories Reusable Dynamic Modular systems - - Dialogue system , player movement 3d , player movement 2d , Tutorial Systems , shop system - Use design patterns & dynamically load data in it eg. load dialogues/shop items as per game needs Static systems - These systems are unique to that specific game & can't be reused Function Conversion : Convert what you can to a function and Make a Gist/document with all Utility functions acting as a dictionary having the function & comment what it does then when you need it search up the Gist file as if needed

Engage in a methodical study of games that resonate with your project’s vision. Deconstruct these games to understand their core functionalities and then creatively adapt those insights into your own codebase. Example: Physics - Study how different genres implement physics. A platformer might have exaggerated, floaty jumps, while a racing game will have more grounded, realistic physics.

Something important to consider irrespective of exactly what genre you are pursuing is the general know-how of your chosen language within a market industry. Performance and capacity to meet your design goals should be a priority, but try to remember that available skill and understanding varies between languages. Choosing a language that has a greater number of experienced writers now and into the future expands your ability to both extend and retain a quality workforce, and allows easy pickup when it's time for team growth or a major change of game maintenance responsibilities. Be idealistic, but remember the real world constraints that make development and upkeep possible.