Power Credits

Power Credits are the main currency of the game and is earned by winning any battle, single player, online, or challenge. They can be used to buy packs, most characters, support cards, and upgrades to Special Attacks and Super Moves.

They can also be bought from the digital store (ex. Apple Store) for real-world money. Prices vary dependent on the credit amount requested, and the price went up in version 2.4.

In version 2.5, NetherRealm Studios added a feature in-game that allows users to watch videos for free power credits, to compensate for posts on the forums regarding them, as well as promoting advertisements.

Trivia

 * The maximum amount of credits one can attain is 999,999,999,999, although this is only possible if you hack the game, or unless if you've been saving up for a REALLY LONG TIME!