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.
Wheeler's Wild Ride:
Get the Lenny going by using the up arrow to speed up and the down arrow to put on the brakes. Pressing the left arrow key will lift up the front end of the bike, while the right arrow key raises the bike's rear wheel. Hit the space bar to change direction and flip the left and right arrow controls. The left and right arrow keys and the space bar can be used to do tricks while airborne, such as flips, wheelies, and 180s, which will earn you some extra points along the way!