Bad Piggies Free

The free version of Bad Piggies was released on December 12th, 2012 (the day after Angry Birds Star Wars Free was released). It features 30 levels, 12 levels in Ground Hog Day, and 4 others in other episodes. The Field of Dreams sandbox could also be purchased, with an upgrade to unlock all the levels added at a later date. In 2016, the game was updated to include all of the levels for free, but most of them can be unlocked by watching in-game ads. This is the only version of Bad Piggies Free that still works with iOS 11 or later. Because of this, it is also the only free version of any Angry Birds game that runs on 64-bit architectures.

Discontinuation
The app was discontinued when custom parts were added into the full version which became free with ads as a result.

Trivia

 * On the title screen of both free versions, it still has the old "free" text from the former app icon.
 * On the Free HD version, it also has the old "HD" text in the blue circle from the former app icon.