The Progress Pack is a limited-time offer that rewards you as you clear normal levels. By simply progressing in the game you fill up the Progress Pack meter when this event is active. Each milestone you reach unlocks new rewards. If you complete enough levels during the event, you’ll unlock the final tier of the pack for the biggest prize.

The event runs for a set time, shown by a countdown timer, so make sure to keep playing before it ends to claim all available rewards.