Is there a way to restart a challenge when you've made a mistake on(e.g. an extra commit)? `git start <challenge_name>` appears to keep the same state of the gi

Is there a way to restart a challenge when you've made a mistake on(e.g. an extra commit)? `git start <challenge_name>` appears to keep the same state of the git branches associated with the challenge. I'm also noticing when trying to rollback to a previous commit with `git reset HEAD --hard <commit_id>` that I'm getting `fatal: Cannot do hard reset with paths.`