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README.md

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-# sudox
-Sudoku Solver with Knuth's X-Algorithm
+# Sudo-X
+
+This Sudoku solver written in Pascal was my Matura project in 2006.
+
+It's consisting of a GUI where you can generate new Sudokus, solve them and get help if you don't know further. The Sudoku generation is achieved by using [Knuth's Algorith X](https://en.wikipedia.org/wiki/Knuth%27s_Algorithm_X) and backtracking.
+
+The main challenge was processing the data structure using recursive function calls. As data structure I used big arrays. This is the most pragmatic approach and not very fast because most of the fields are zeroed. A stretch goal would have been to use double-linked lists (the "dancing links" extension).
+
+![](https://github.com/schmijos/sudox/raw/master/screenshot.png)