There are puzzles that are not meant to have a "Run" button. For example, http://studio.code.org/s/course2/stage/10/puzzle/1 You'll notice there is a step button under the playspace. Please use this "Step" button that appears to the right of where the "Run" button usually appears. The "Step" button executes a program, one command at a time, and it a great tool in finding "bugs" or issues in a given program. These puzzles are intended to teach students how to use the "Step" button.
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