This walkthrough tutorial shows you one way to get 3 stars in Angry Birds Bad Piggies Level 21-4 (Angry Birds Classic / Original). Visit http://www.AngryBirdsNest.com for more Angry Birds walkthroughs, news, user submitted strategies, and interactive leaderboards!
Note, this was previously Angry Birds Bad Piggies Level 20-4. Rovio shifted some chapters around in the v4.1.0 update. More info on the v4.1.0 update can be found here, http://angrybir.de/1jOuHkR.
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Bad Piggies 21-4 is the fourth level of Bad Piggies. Fire the Yellow bird into the triangular...