added new entries

games/puzzle/_toc.md

@@ -11,6 +11,7 @@
 - **[Fish Fillets - Next Generation](fish_fillets_ng.md)** (C++, GPL-2.0, mature, inactive since 2011)
 - **[Frozen Bubble](frozen_bubble.md)** (Perl, GPL-2.0, mature, inactive since 2012)
 - **[Grabble](grabble.md)** (Java, ?, mature, inactive since 2006)
+- **[HoDoKu](hodoku.md)** (Java, GPL-3.0, mature, inactive since 2013)
 - **[KAtomic](katomic.md)** (C++, GPL-2.0, mature)
 - **[Me and My Shadow](me_and_my_shadow.md)** (C++, GPL-3.0, beta)
 - **[Pingus](pingus.md)** (C++, GPL-3.0, mature)

games/puzzle/hodoku.md

@@ -0,0 +1,15 @@
+# HoDoKu
+
+_Sudoku generator/solver/trainer/analyzer._
+
+- Home: http://hodoku.sourceforge.net/en/index.php, https://sourceforge.net/projects/hodoku/
+- State: mature, inactive since 2013
+- Download: https://sourceforge.net/projects/hodoku/files/
+- Platform: Windows, Linux
+- Keywords: puzzle
+- Code repository: https://svn.code.sf.net/p/hodoku/code/HoDoKu/trunk (svn)
+- Code language: Java
+- Code license: GPL-3.0
+
+## Building
+