Retro gaming enthusiasts want to tweak classic game saves but lack user-friendly tools.
Build a web app that parses save files from games like SimCity 2000, showing editable values with explanations of what they control.
Gamers would pay for premium features like cheat presets. Monetize through donations or small payments.
Launch with support for 2-3 popular games' save formats first.
Risk: Legal gray area around game modification.