* Windows 2000/XP
* DirectX 9
* 1GHz Pentium III or higher
* Video card with VRAM 64MB or above
* 2GB of hard disk space
* 256MB or more of system RAM
* Keyboard, mouse, 4 button gamepads recommended.

more detail Hard disk space for Expansion

* RBO - about 1,40 GB + 150MB for save files.
* Ex1 - about 450 MB + 260 MB for save files.
* Ex2 - about 470 MB + 65 MB for save files.
* Ex3 - about 320 MB + 65 MB for save files.

Saving more replays will increase the requirement. You should also keep some space for Windows swap file.

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