Sound Performance Index (SPI) is a ranking calculated from all your audio game scores (Beat games are not calculated).
SPI helps you compare your strengths and weaknesses across games that challenge different listening skills.
We calculate the SPI by the 3 top scores in each game. The high-score provides you x3 points, the second score x2, and the third x1. As you pass levels you will get more points for a correct answer and your, resulting with higher game scores and higher SPI.