Meerca Chase II is, in my opinion, one of the most lucrative games on Neopets. I always play on Hard in the Classic Mode and average 400-450np a game, but it is very easy to get higher scores- with practice! The Maze and Freestyle modes were added to spice things up and to replace the secret levels that the original Meerca Chase enjoyed. Although they are fun and help you work on essential skills, they are too difficult for serious earning.
When you have chosen your mode and difficulty, you can choose your background colour. I personally stick with the grey, both because it was in the original and because it’s easiest on the eyes. Different colours make different Neggs stand out; experiment to see which is best for you.