United States Army NRE 3GS21B puzzle, based on an original photo by Brent Michael (photo copyright Brent Michael -- used with permission). Photographed at Clarksville, Tennessee, February 10, 2015.
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The "Easy" version of the puzzle has about 100 pieces, "Medium" has about 200 pieces, "Hard" is about 300 pieces. For the Online puzzles, see the Online Puzzle Tips.