Line Rider—one of the more popular Flash-based game diversions—has come to the iPhone. InXile Entertainment offers it for $3, and it’s worth the price of admission.

Line Rider iRide takes an exceedingly simple concept and makes it a fun game: You draw a downward slope, then click a “play” button to put a little toboggan rider at the very top. You don’t have to limit yourself to just a downward slope, either—you can build ramps, loop-de-loops, and all other manners of obstacles and pitfalls for your little rider to explore.

Bosh, the sledder in question, goes caroming around from place to place, occasionally nose diving into an ill-considered obstacle or flipping his sled over all together. Despite the simple line-based graphics, Line Rider is incredibly addictive.

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