How to get: To unlock: you have to purchase the Piggy Bank in the in-game store for $3.99. You cannot win it or unlock it in any other way.
Traits: The Piggy Bank adds red coins to every
playthrough that are worth five gold apiece, in addition to the standard
yellow coins worth one gold. These red coins will be present no matter
which character you use: you don’t have to play as the Piggy Bank to
collect them, you only have to have him unlocked. Having the Piggy Bank
also makes every video ad you watch worth 40 coins instead of 20. The
Piggy Bank runs on the standard grassy map. When he jumps, coins fly out
of the coin slot on his back. He occasionally snorts softly, but mostly
makes the jangly noise of raining coins.