Challenge Mode is the opportunity to visit completed levels again, and earn Coins and Cups.

This mode becomes available only after passing all the currently available levels.
The Challenge mode stands to its name, and you will face the most difficult levels from the game in random order.
When a new update is released you will play new levels and once you complete those you will return to Challenge mode.

You will receive Coins and Cups as a reward for every 5 levels you complete. The more Cups you have, the higher you will be on the Leaderboard.