Bohemia wants to have just one version of the game.

This past week, the zombie survival game DayZ was banned in Australia both at retail stores and then later from digital stores. The game was refused classification because it would "depict, express or otherwise deal with matters of sex, drug misuse or addiction, crime, cruelty, violence or revolting or abhorrent phenomena in such a way that they offend against the standards of morality, decency, and propriety."

The game has characters using morphine to help treat injuries. They player can also restore some...