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:

Castle Expansion Costs
Cost (gold)
Crafting 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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