Document new Sudoku puzzles in the assigment's index.shtml.

diff --git a/assignments/archive/sudoku/index.shtml b/assignments/archive/sudoku/index.shtml
index ddc5c145df3fa0e493029732b05b03c18e09c288..d8b2375dfbb136a6e878cc7a72fa21f997d1685f 100644 (file)
--- a/assignments/archive/sudoku/index.shtml
+++ b/assignments/archive/sudoku/index.shtml
@@ -126,9 +126,13 @@ cat initialboard | ./sudoku
 </pre>
 
 <ul>
+  <li><a href="0.cfg">0.cfg</a> (impossible, to test your programs
+    failed-to-solve behavior)</li>
   <li><a href="1.cfg">1.cfg</a></li>
   <li><a href="2.cfg">2.cfg</a></li>
   <li><a href="3.cfg">3.cfg</a></li>
+  <li><a href="4.cfg">4.cfg</a> (harder puzzle, you can't solve this
+    with the basic algorithm given above)</li>
 </ul>
 
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