The mission structure of Grand Theft Auto IV is considerably different from previous games in the series. Rockstar North are aiming to give players more freedom, more choice, and a greater sense of control over their character's destiny. The game still follows a narrative path, but it's quite different in the sense that the story can be told in a number of different ways, depending on the player's actions.
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Thanks for your many comments & the poem - your poem was wonderful.