A newton (a measure of force) N is a flash game available for download or online play.
visit this website to play
http://www.jeffwu.net/games/ngame.swf
In the download version of N there are 100 episodes each of which has five (5) levels. User made levels can be downloaded in addition to the 500.
Controls are:
SHIFT to jump, and LEFT and RIGHT to move.
Gameplay comes in many varieties such as action, problem solving, skill, races, puzzles, and more.