Mortal Kombat is the first fighting game to adopt the deeply controversial online pass model - and though you'll get a code included with a new copy (two free taster days of online multiplayer regardless of version) many gamers will be outraged at the extra expense after buying it preowned.
NetherRealm boss Ed Boon has stepped up to defend the measure, stating that online passes are "necessary for games, period."
When we sell a game, we need to recuperate the cost of development. These games cost many many millions of dollars to produce. If somebody is re-selling our game and cutting us out of the sharing of the profits of the game, to pay for our games we need to do something to protect our investment.
The people who only rent games or people who only buy used games probably go through a lot more games in a shorter period of time. We feel like in order for us to continue to make games, we need to get enough back to pay for it. That’s the motivation there. - NetherRealm's Ed Boon to EG