no it is impossible,
no game can play against other systems. This is partially for the same reason that you can not play a game disc for another system in your console. They are not the same game, but are different versions of the same game
No, different systems use different servers. But that would be cool
yes you have to trade in other game systems such as a nintendo ds or dsi
No, you cannot link different consoles' account systems with the PlayStation Network.
its not possible
You can play online with other people with "warhammer"
yes you can play games from other systems such as the original game boy or game boy color!
Any accessories made for the Wii gaming console cannot be used with any other game systems.
If they should make the game for other systems, then they would have to code the game for those systems. There are a lot of different types of systems out there and making the game availabe on each of them would be to time consuming and cost a heck of a lot of money.
no, i don't think that's possible. You can only buy systems, and rent games. SO NO JEEZ
No it is not even possible to play the download without the game
No other system but the PS3