Windows 95, 98, 98SE, ME, NT 4, 2000, XP
Home, XP Professional, XP 64-bit Professional, Vista 32-bit or Vista
64-bit
16 Mb free RAM,
100 MHz processor (play levels 1-2) / 800 MHz processor (play level 3).
Recommended:
1 GHz or faster processor,
128 Mb free RAM (for the end-game solver).