The Challenge

The Challenge is a secret level that you can play in Geometry Dash World and was added to the full version in Update 2.1. It features a number of 2.1 mechanics and items, including the spider and dash orbs.

Unlocking the Challenge
To unlock the challenge, you must first have unlocked the Vault of Secrets, which requires 50 diamonds. Then, once inside, enter the code "The Challenge" and the level play button will appear. It requires 200 Diamonds to play.

Reward
Upon beating the challenge, you are rewarded with access to The Basement, which has a chest containing an icon as a reward.