On what machine is it played?

( Dr Preference AjcuiVd289, Sun 5 Jul 2009, 15:29, archived)

By 'machine', do you mean 'console'?
Just on PC
( Major Turd for tonight only, Sun 5 Jul 2009, 15:31, archived)

I meant console, PC, Mac, ZX81, whatever.

( Dr Preference AjcuiVd289, Sun 5 Jul 2009, 15:34, archived)

PC
and steam powered differencing engine
( RedStar returneth, Sun 5 Jul 2009, 15:32, archived)