Expansions are the plots of land in your Castle that are used to build your Buildings on. After the first two, they are unlocked in sets of 4 building spots, either in a 2x2 or 2x 1x2 layout and get progressively more expensive to unlock both in gold and time:
| 1 | 500 | 2 minutes |
| 2 | 1,000 | 15 minutes |
| 3 | 2,000 | 30 minutes |
| 4 | 5,000 | 1 hour |
| 5 | 80,000 | 2 hours |
| 6 | 500,000 | 8 hours |
| 7 | 1,000,000 | 24 hours |
| 8 (final) | 2,000,000 | 48 hours |
Unlocking time can be skipped at the cost of 1 gem per hour remaining. You can't unlock more than 1 Expansion in parallel. There seems to be no deeper reason to the different blue and red colored plots. They are just placed in a checker board pattern to indicate the limits. Every expansion will give you 4 spots. The 2 blue lined 2-spot plots in the middle form 1 expansion together. Placing Guard Towers strategically doesn't seem to matter since no one is rushing in the front door to attack. The Dark Prince will not counter attack.
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