Gitsanity
Nothing proves you are a good nerd like being able to make git do your bidding. This is the sort of problem you either know how to do, or it will take you 6 hours. Either way, highly deterministic and if someone puts the time in, they will solve the problem.
Plus you might learn something useful in real life!
Follow all the walkthroughs here:
a href="https://jaimelightfoot.com/blog/tuctfs-ready-player-one-challenges-hint-git-is-your-friend/" target="_blank"https://jaimelightfoot.com/blog/tuctfs-ready-player-one-challenges-hint-git-is-your-friend/</a>
Submit anything you struggled with.