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I'd like to start anew with a reactor, scrapping all the current waldo programming. Can it be done? (I'm on a level with no top-level map, just a reactor. Not sure if that matters.)

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up vote 16 down vote accepted

You can click-drag to select the whole play field and hit Delete.

Sadly there is no Ctrl-A to select all, or that would be the way to go.

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Additionally, you can toggle visibility of one of the red or blue layer if you only want to select/delete all of one layer – Matt Apr 13 '12 at 19:48

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