I made a project that uses lists for collision. Using a little block, you can move around in a little area but all the collision is stored in a list. Go to http://scratch.mit.edu/projects/dsdude10labs/321331 to see it and in the project notes, you can find how i made it
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I made something like that too.
http://scratch.mit.edu/projects/archtest/321520
Programming with lists is the key is making REALLY good scratch games. You could reproduce the entire game of the original mario bros and it would be less than 10 megabytes.
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