File list (Check if you may need any files):
sudokugame\.classpath
..........\.project
..........\.settings\org.eclipse.jdt.core.prefs
..........\background\Thumbs.db
..........\..........\background.jpg
..........\..........\blue.JPG
..........\..........\butterfly.JPG
..........\..........\green.JPG
..........\..........\silver.JPG
..........\..........\while.JPG
..........\.in\Control\Action.class
..........\...\.......\Control$1.class
..........\...\.......\Control$10.class
..........\...\.......\Control$11.class
..........\...\.......\Control$2.class
..........\...\.......\Control$3.class
..........\...\.......\Control$4.class
..........\...\.......\Control$5.class
..........\...\.......\Control$6.class
..........\...\.......\Control$7.class
..........\...\.......\Control$8.class
..........\...\.......\Control$9.class
..........\...\.......\Control.class
..........\...\.......\Excute.class
..........\...\Model\CreateData.class
..........\...\.....\Data.class
..........\...\.....\EasyLevel.class
..........\...\.....\FindGroup.class
..........\...\.....\HardLevel.class
..........\...\.....\ISudoku.class
..........\...\.....\Level.class
..........\...\.....\MediumLevel.class
..........\...\.....\Observerable.class
..........\...\.....\Sudoku.class
..........\...\.....\VeryHardLevel.class
..........\...\View\About.class
..........\...\....\Dialog.class
..........\...\....\MainFrame.class
..........\...\....\Mess.class
..........\...\....\Observer.class
..........\...\....\writeTable.class
..........\...\resources\sodoku.properties
..........\...\utils\PropertiesManager.class
..........\resource.txt
..........\src\Control\Action.java
..........\...\.......\Control.java
..........\...\.......\Excute.java
..........\...\Model\CreateData.java
..........\...\.....\Data.java
..........\...\.....\EasyLevel.java
..........\...\.....\FindGroup.java
..........\...\.....\HardLevel.java
..........\...\.....\ISudoku.java
..........\...\.....\Level.java
..........\...\.....\MediumLevel.java
..........\...\.....\Observerable.java
..........\...\.....\Sudoku.java
..........\...\.....\VeryHardLevel.java
..........\...\View\About.java
..........\...\....\Dialog.java
..........\...\....\MainFrame.java
..........\...\....\Mess.java
..........\...\....\Observer.java
..........\...\....\writeTable.java
..........\...\resources\sodoku.properties
..........\...\utils\PropertiesManager.java