Level Review Score

A review score is meant to give an idea of the level's quality as judged by the community.

The review score is calculated using the following:

$$\text{totalUp} = \sum \frac{\text{rating} - 1}{4}$$

$$\text{totalVotes} = \text{number of ratings}$$

$$\text{reviewScore} = \frac{\text{totalUp} + 2}{\text{totalVotes} + 3}$$

When a level is first published, - is displayed for the review score to indicate there are no reviews.

You can see review scores on the search page, and you can find the implementation here.