Algodoo

Interesting idea, but as you probably know, it does have a few problems such as: 1. The head detaches from the body while in a tight turn. 2. When the scene is paused, the snake's segments can easily move away from each other, and they will not reattach when the scene Runs again if moved too far away from each other. 3. The segments easily separate from each other when another object bumps into them, or if the load they are pulling is too heavy.
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There are other issues, but these are the ones I found right away.