N+ is the expansion of a free-to-play Flash game, simply titled
N. In this portable version for the PSP and Nintendo DS, there are more levels and unlockable content than was found on the downloadable version. The premise is very simple: Players race against a ticking clock to try and clear a series of levels, which increase in complexity. The goal is to reach a button in one location of the level to open a door, and then race to the open door all while collecting gold scattered throughout the level. The gold is more than just additional points, as each gold piece found adds to the total time you have to get to the door.
The title uses a great deal of real-world physics, which come into play as your character is jumping over bombs and turrets. This adds a sense of realism to a title which otherwise is pretty far removed from reality. For example, long falls will end your attempt on a particular level. Also, attempting to make very long jumps which defy the laws of gravity is impossible, so using momentum and learning proper control is of utmost importance. Thankfully, the game controls are wonderful.