Design Challenges Season 21 started November 4, 2022, and ends December 1, 2022. It is the 8th season to not include Contest of Mayor Season buildings. It is the 18th season to use the Blueprint Exchange reward format. It is the 12th season to have rewards depending on Design Challenge Leagues. It takes 4,500 blueprints to unlock all 3 buildings or 2,000 to unlock the Floating Pod. This season includes 1 new limited time building and 2 returning limited time building. There were 7 challenges this season. They were City of Gardens, Tropical Haven, Green City, Water City, City Center, Skyscraper City and Future City.
| Reward | Blueprints |
|---|---|
| Floating Pod | 2,000 |
| Greenhouse | 1,500 |
| Swan Lake | 1,000 |
| 3 Platinum Keys | 600 |
| 3 Golden Keys | 300 |
| 2 of each Expansion Item | 150 |
| 2 of each Beach Item | 250 |
| 2 of each Mountain Item | 250 |
| 5,000 Simoleons | 50 |
| 50 SimCash | 200 |
| 100 SimCash (Silver League) | 250 |
| 5,000 War Simoleons (Silver League) | 200 |
| 200 SimCash (Gold League) | 300 |
| 5 of each Storage Item (Gold League) | 400 |
| 5 of each Expansion Item (Platinum League) | 350 |
| 5 Golden Keys (Platinum League) | 500 |
Previous Season: Design Challenges Season 20
Next Season: Design Dash Season 7