Generally, you would need special PC software to "boundary break" a game, but if you are just talking about going anywhere you want naturally, just play through the entire campaign.
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No, Dead Space 2 does not have a free roam mode. You can however start a new game+ from the menu that carries over the weapons, suits, ammo, credits and power nodes from the last save.
There is no way of running on Dead Rising 2
No, but there will be one for Dead Rising 2.
Dead rising 2 has better graphics and sound but the 1st dead rising has easier missions so really its your decision but i like dead rising 2 much better good luck deciding
Yes Dead Rising 2 will be an online multiplayer game.