What is a review challenge?

Review challenges began in Heather’s reader group in 2019 with bonus scenes being offered for every 100 reviews. Currently, review challenges earn bonus scenes for releases beginning at 500 reviews, at 1000 reviews, then for every 1000 reviews after that. (i.e. 1st bonus scene at 500 reviews, 2nd at 1000, 3rd at 2000, etc.)