In order for you to play Castles on Windows with minimal graphics settings, your computer must meet the following requirements
Operating System:
XP, Vista, 7, 8, 10
Processor (CPU):
1.8 GHz
Memory (RAM):
512 MB RAM
Graphics Card:
3D graphics card compatible with DirectX 7
DirectX:
Version 7.0
Storage:
7 MB available space
In order to play Castles on Windows with maximum graphics settings, you need a computer with a configuration no worse than the following
Memory (RAM):
1 GB RAM
Graphics Card:
3D graphics card compatible with DirectX 9
DirectX:
Version 9.0
Storage:
15 MB available space