2007-06-10 The technical challenges involved in implementing a sudoku puzzle generation algorithm on a handheld video game console, and how the developers at Zoonami solved them in the production of Zendoku This article describes some of the technical challenges involved in implementing a sudoku puzzle generation algorithm on a handheld video game console, and how the developers at Zoonami Limited solved them in the production of Zendoku , released in Spring 2007 on the Nintendo DS and Sony PSP . 2. Requirements Let's start by considering the requirements the puzzle generator must satisfy. It must generate proper sudoku puzzles: there must be exactly one valid way to complete the grid. It must be able to generate puzzles with a wide range of difficulties, so that we can please players of different skills, and so that we can present a graded series of difficulties in Zendoku's story mode. At each difficulty level, puzzles must not differ very much in difficulty.
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