LineRider is not really a game but a piece of art. I wrote an article about it just a month ago ( linerider ) and would like to take the opportunity to write about the changes since then. Line Rider gives you some basic drawing tools and a unlimited workspace at hand. The first phase is the drawing phase. You draw lines on the screen, lines that are somehow connected. The second phase is the playback phase. A Linerider, better a guy on a slade, falls out of nothing from the sky at the exact position you drew the first line.
He then races along the lines that you have been drawing to finally meet the end of a line or fall of the slade. Line Rider had a big community who liked the challenge and created some stunning works with the tools at hand. The biggest problem with the old version was the missing eraser, if you made a mistake you had to start all over again, no second chance.
The new version of LineRider adds an eraser, an accelerator to speed up the slade, a zoom function and a reverse line option. Take a look at the movies section on the new Linerider website to get an impression of what can be done using those simple tools. My old article had some videos as well in it.

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[...] Selon Wikipedia Linkrider a devenu un phénomène sur le Net durant le mois d’octobre. Il a été créer par Boštjan Čadež, étudiant slovène et membre de deviantArt, le nombre de téléchargéments a dépassé le cap de 1 million le 8 novembre. via ghacks [...]