You can choose to place a minimum of $5 at most stores to "pre-order" a game that is not yet released. That guarantees you that when the store gets copies on release date, they will put one aside for you so that you are guaranteed a copy, even if the regular copies sell out.
The bonus code they are giving away with the pre-order condition is just more incentive to get you to pre-order the game.
The bonus code they are giving away with the pre-order condition is just more incentive to get you to pre-order the game.