This is a new challenge. SIREN that is great new video game of PLAYSTATION 3 will be sold through network, before Blu-ray edition. You can buy the Blu-ray edition by 5,980 JPY at 24th July, but if you want to get the download edition, you can buy it by 5,500 JPY at 14th, July. In other words, the download edition is cheaper and earlier than the Blu-ray edition.
However, you can not see the goal of this game around players who play SIREN with Blu-ray edition. Because, when you get the download edition of SIREN, the most part of this game is locked. The lock will be unlocked slowly with time. The last part of this game will be unlocked at 24th, July. You can not see the goal of this game, until the Blu-ray edition will be sold.
What do you think about this model? I want to get experience from this model, so I will buy the download edition not the Blu-ray edition. But, this game is pretty scary. I will buy this game, but I might be unable to play this game. :D