Seeking Real-World Business Logic Flaws for CTF Room Inspiration

The post author is creating CTF rooms based on real-world business logic flaws, predictable systems, and unintended feature exploits rather than traditional vulnerabilities. They seek examples involving business logic errors, poor randomness, predictable algorithms, pricing mistakes, race conditions, or unexpected abuse of designed features. Two existing rooms are highlighted: Calculated Luck (inspired by a lottery loophole) and Take It or Leave It (based on predictable game show case values). The author requests feedback on provided room links.