Theme 20-9

You may be looking for:

Angry Birds (Classic)

 * Bad Piggies 21-9, before Surf and Turf was updated to be numbered
 * Surf and Turf 20-9, after change

Angry Birds Seasons

 * Haunted Hogs 2-9, if you don't count the Facebook levels
 * Piglantis 1-9, if you count the Facebook levels