An Ingenious Video Game That Looks Like It Was Designed by a Third-Grader
slate.com
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Not crayony or goal-oriented, but a lot of the same physics sandbox concepts. Oh, and you can download it right now.
I think it might be because realistic rigid-body physics are still fairly novel in games, and seeing realistic reactions in-game is inherently satisfying for some reason. I think we'll see a continuing rise in the number of "physics-based ______" formula games, followed by a sharp decline.
This reminds me of a tool that was developed by ParaGraph back in 90s (the same company that developed handwriting recognition for Apple's Newton). Their app allowed creating TrueType characters by drawing a simple raster image. This is stunningly impressive if you consider that TrueType is essentially defined by geometric splines. Converting raster image into a set of curves is an extremely unobvious thing to do, but on the surface the whole thing looked quite ordinary and trivial.
Same thing with Crayon Physics - trivial on the surface, but complex on the inside. And this is what's impressive about it.
You can check it out for yourself: http://box2d.org. You can also download several of the Game Developers Conference presentations given by the original author here: http://www.gphysics.com/downloads
An enterprising chap has also ported the original C++ code to Flash: http://box2dflash.sourceforge.net
I read that it was actually 10 programmers working on the Unreal engine and tools and 20 artists doing something with their efforts for 2 years. They did have a $10 million budget, though.
http://news.ycombinator.com/item?id=122548
I think adjectives are necessary in the title to convey how cool it is, maybe.