A few weeks ago the Heavy Rain front boxart was released, and today GameStop has made available the back boxart which reveals a mandatory 4.2GB PS3 HDD installation.
For those curious, Sony has also confirmed that they will offer a Heavy Rain alternate PS3 box art print out on launch.
To quote from JustPushStart.com (linked above): "You might want to save an extra 4.2GB of space in your hard drive as the game will REQUIRE (as the game boxart suggests) you to install the game's data in order to proceed.
It sure is a lot of space but as you are waiting for the data to install in your hard drive, there will be a guide showing you on how to make a Swan Origami (as featured in the game) while you're waiting for the game to install."
Heavy Rain pre-orders are now available for $59.99 and the PlayStation 3 title is scheduled to ship on February 23, 2010.
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