Guide:
Keyboard keys move the character.
You can do missions or leave them aside to do whatever you want in the game, in an open world, you can get rich or die... Just kidding! Or use cheats.
I also think that this game has and will be part of several generations. Cj, is a friend, and in his legacy he lived as a hero for all. Remember, games aren't violent, people are. Thank you Carl Johnson, for being a part of my childhood.