The NP ratio tells you how many Neopoints you'll earn for every point you score while playing a game.
For example, if the NP ratio is 100 NP for every 150 game points scored, to earn the maximum 1,000 NP reward for playing, you'd have to score 1,500 points during the game.
On the other hand, if a game's NP ratio is 25 NP for every point scored, you'd only have to earn 40 points in the game to get the full 1,000 NP for playing.
Catch the Petpet:
In each level, a specific Petpet is hiding in a crowd of Petpets, and it's up to you to catch them! At the beginning of each level, you will be told which Petpet you need to find. Use your mouse cursor to click on the correct Petpet's location. Each incorrect guess earns a strike. Earning three strikes or running out of time ends game play.