Worked on the CCC-Server/CCC-Database repository to address a critical bug in Tachyon card cost validation, focusing on enforcing correct gameplay rules within a game development context. Utilized Lua scripting to refine the cost filter logic, ensuring that only monster cards could be used as costs for Tachyon, thereby preventing spells and traps from being incorrectly removed. This update normalized Tachyon’s behavior across various edge cases and improved overall rule enforcement. The work demonstrated proficiency in scripting and game logic maintenance, with clear traceability through commit history, and contributed to more consistent gameplay and reduced risk of balance issues.