1. Replace all images in res/drawable-hdpi with your own
2. To change ads go in res/layout game_screen.xml and replace ads:adUnitId="a150fab4774ac95" with your own id
second res/layout game.state.xml replace ads:adUnitId="a150fab4774ac95" with your own id
3. Rename application package
4. Rename application res/values strings.xml <string name="app_name">PuzzleDrag</string> replace PuzzleDrag
5. Run your app
If you have any questions feel free to add a comment.