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Title: Sudoku YD638 is a piece of junk
Review: I received this #!@$$^& piece of Chinese junk as a Christmas present. Never could get it to work. The directions are in such fractured English and so unclear that they were zero help. The screen display had many incomplete characters; so maybe the software was defective. On top of that there were too many useless features. I gave up and threw the device in the trash can, where it belongs.
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