All Challenges - except the “Daily” Challenge - have Restrictions. These are what make the Challenges challenging!

 

Certain items are required to be used before you can submit your design. You will see a Challenge’s restrictions on the introductory page to each Challenge.

 

While designing, your Restriction progress is tracked in the center-right of your screen. Tap the fraction (ex: 1/2) to see your progress on completing your restrictions.