1. Sudoku is good for you brain....but it may compromise your PC if you have downloaded one of the excel files with embedded malicious script inside that offers you to play the subject game. Peter Szabo from SophosLabs has identified a piece of malware that resides behind a Microsoft Excel-based Sudoku generator. The Malware developed in Visual Basic requires macros, a scripting language that allows users to create equations based on values in different columns and rows. Microsoft – Malware behind Microsoft Excel-based Sudoku generator.
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2. Although by default the macros are disabled in any Microsoft Office application....but any one who downloads the excel file would eventually enable the macros that run the script to play the game...so he can keep playing the game while the script in the background sets up the malware and establishes contact with its master bot.....so like always the updated Antivirus on the system will keep sitting without catching up anything.....so comes the importance of packet analyzers like Wireshark....ethreal etc...but then it becomes slight technical which in most cases would be out of purview for a common user.