Trading Cards

 are a limited-time currency released on June 14, 2016, as part of the Superheroes 2016 Event. They are the only currency used to craft prizes in the event.

They can be obtained by,
 * Tapping Criminals that spawns in the player's town.
 * Tapping Criminals in the player's neighbor towns for the 30 first actions.
 * Completing event themed Daily Challenges.
 * Obtaining social prize number five.
 * Collecting from Coolsville.

US$