Your Poker Level is determined by your Poker Rating number. Poker Levels are divided into three groups defined by colors, starting at the Red level, then progressing to the Green level and finally to the Black level -- the highest color level. PurePlay runs special poker tournaments in which you can compete against players with the same Poker Level color as you.
As you play more poker tournaments, the size of the tournaments and how you place in these tournaments will determine whether your rating and color level move up or down. In general, the better your performance, the higher your numerical Poker Rating score and Poker Level color.