This special pack introduced in Version 1.29 added the Strength card, along with a huge number of new combos. When purchased, the player receives 3 random Muscle Cards from the card pool below. The Strength card is not guaranteed, even though it is the most valuable. Starting with this pack, however, there are a limited number of cards available in the pack, so the more packs you buy, the more likely you are not to get duplicates.
The Muscle Pack is unlocked from March 4, 2015 to March 14, 2015.