The best coding interview puzzle I've ever done involved a (fictional) thrice-cursed data-management system with inaccurate documentation and a couple nasty tra

The best coding interview puzzle I've ever done involved a (fictional) thrice-cursed data-management system with inaccurate documentation and a couple nasty traps. Instructed to collaborate with the interviewer as if they were a coworker, you had to adapt another piece of software to this system so that they could migrate it. I was awestruck by how many ways it tested your real competence at the actual day-to-day of the job.