N+

N+ (like its predecessor N) plays with only one button and the directional pad, used to control a small black ninja. Players jump, dodge, climb and rebound from walls, collecting gold on their way to a level's exit. Each level the player enters has a time limit based on the ninja's "metabolism" which, according to the instructions for the games, gives the ninja an extremely short life-span and a "thirst for gold". Gold increases the remaining time for players, thus remaining a valuable item to collect. While the player is given infinite lives, death can still come swift and often, a key design feature of N+. Anything that is dangerous to the ninja will kill him instantly. Droids of varying abilities (flying, ground-based, chasing, and laser droids) can kill the player on contact, as can proximity and timed mines, laser and missile turrets, and simply falling from a dangerous height. Other dangers include one-way walls that can trap players and blocks that fall down on players underneath them, similar to Thwomps from the Super Mario series. Often, timing-based jumps or momentum-based puzzles come into play in order to reach the goal, and usually switches are required to open multiple locks that block the way to the door, creating a more complex structure than simply reaching the exit. The Xbox Live Arcade version of the game features multiplayer and map-editing, while the DS and PSP versions feature map-sharing and new multiplayer modes in addition to the features of the XBLA version.